diff --git a/dlls/advapi32/tests/service.c b/dlls/advapi32/tests/service.c
index 268827e043c..da62b0b5e8b 100644
--- a/dlls/advapi32/tests/service.c
+++ b/dlls/advapi32/tests/service.c
@@ -1110,7 +1110,7 @@ static void test_enum_svc(void)
     /* Store the number of returned services */
     tempreturned = returned;
 
-    /* Allocate less then the needed bytes and don't specify a resume handle */
+    /* Allocate less than the needed bytes and don't specify a resume handle */
     services = HeapAlloc(GetProcessHeap(), 0, tempneeded - 1);
     bufsize = tempneeded - 1;
     needed = 0xdeadbeef;
@@ -1128,7 +1128,7 @@ static void test_enum_svc(void)
     }
     HeapFree(GetProcessHeap(), 0, services);
 
-    /* Allocate less then the needed bytes, this time with a correct resume handle */
+    /* Allocate less than the needed bytes, this time with a correct resume handle */
     services = HeapAlloc(GetProcessHeap(), 0, tempneeded - 1);
     bufsize = tempneeded - 1;
     needed = 0xdeadbeef;
@@ -1173,8 +1173,8 @@ static void test_enum_svc(void)
 
     /* Vista only shows the drivers with a state of SERVICE_RUNNING as active
      * and doesn't count the others as inactive. This means that Vista could
-     * show a total that is greater then the sum of active and inactive drivers.
-     *
+     * show a total that is greater than the sum of active and inactive
+     * drivers.
      * The number of active and inactive drivers is greatly influenced by the
      * time when tests are run, immediately after boot or later for example.
      *
@@ -1460,7 +1460,7 @@ static void test_enum_svc(void)
     /* Store the number of returned services */
     tempreturned = returned;
 
-    /* Allocate less then the needed bytes and don't specify a resume handle */
+    /* Allocate less than the needed bytes and don't specify a resume handle */
     exservices = HeapAlloc(GetProcessHeap(), 0, tempneeded - 1);
     bufsize = tempneeded - 1;
     needed = 0xdeadbeef;
@@ -1478,7 +1478,7 @@ static void test_enum_svc(void)
     }
     HeapFree(GetProcessHeap(), 0, exservices);
 
-    /* Allocate less then the needed bytes, this time with a correct resume handle */
+    /* Allocate less than the needed bytes, this time with a correct resume handle */
     exservices = HeapAlloc(GetProcessHeap(), 0, tempneeded - 1);
     bufsize = tempneeded - 1;
     needed = 0xdeadbeef;
diff --git a/dlls/d3dxof/d3dxof.c b/dlls/d3dxof/d3dxof.c
index d1f580c5079..9f19d5fb997 100644
--- a/dlls/d3dxof/d3dxof.c
+++ b/dlls/d3dxof/d3dxof.c
@@ -778,7 +778,7 @@ static BOOL parse_template_members_list(parse_buffer * buf)
       }
       if (cur_member->idx_template == buf->pdxf->nb_xtemplates)
       {
-        TRACE("Reference to non existing template '%s'\n", (char*)buf->value);
+        TRACE("Reference to a nonexistent template '%s'\n", (char*)buf->value);
         return FALSE;
       }
       if (check_TOKEN(buf) == TOKEN_NAME)
@@ -817,7 +817,7 @@ static BOOL parse_template_members_list(parse_buffer * buf)
         }
         if (cur_member->idx_template == buf->pdxf->nb_xtemplates)
         {
-          TRACE("Reference to non existing template '%s'\n", (char*)buf->value);
+          TRACE("Reference to nonexistent template '%s'\n", (char*)buf->value);
           return FALSE;
         }
       }
diff --git a/dlls/mstask/tests/task.c b/dlls/mstask/tests/task.c
index 820b962948f..7cb76737ed8 100644
--- a/dlls/mstask/tests/task.c
+++ b/dlls/mstask/tests/task.c
@@ -126,7 +126,7 @@ static void test_SetApplicationName_GetApplicationName(void)
         CoTaskMemFree(stored_name);
     }
 
-    /* Set application name to a non-existent application and then get
+    /* Set application name to a nonexistent application and then get
      * the application name that is actually stored */
     hres = ITask_SetApplicationName(test_task, non_application_name);
     ok(hres == S_OK, "Failed setting name %s: %08x\n",
@@ -170,8 +170,8 @@ static void test_SetApplicationName_GetApplicationName(void)
         CoTaskMemFree(stored_name);
     }
 
-    /* After having a valid application name set, set application name
-     * to a non-existant application and then get the name that is
+    /* After having a valid application name set, set application the name
+     * to a nonexistent application and then get the name that is
      * actually stored */
     hres = ITask_SetApplicationName(test_task, non_application_name);
     ok(hres == S_OK, "Failed setting name %s: %08x\n",
diff --git a/dlls/mstask/tests/task_scheduler.c b/dlls/mstask/tests/task_scheduler.c
index af3a565cf65..2de0e160496 100644
--- a/dlls/mstask/tests/task_scheduler.c
+++ b/dlls/mstask/tests/task_scheduler.c
@@ -93,7 +93,7 @@ static void test_Activate(void)
         return;
     }
 
-    /* Attempt to Activate a non-existant task */
+    /* Attempt to activate a nonexistent task */
     hres = ITaskScheduler_Activate(test_task_scheduler, not_task_name,
             &IID_ITask, (IUnknown**)&task);
     ok(hres == COR_E_FILENOTFOUND, "Expected COR_E_FILENOTFOUND: %08x\n", hres);
diff --git a/dlls/riched20/table.c b/dlls/riched20/table.c
index 6289e345853..9cb4bbffd65 100644
--- a/dlls/riched20/table.c
+++ b/dlls/riched20/table.c
@@ -29,7 +29,7 @@
  * Richedit version 1.0 - 3.0:
  *   Tables are implemented in these versions using tabs at the end of cells,
  *   and tab stops to position the cells.  The paragraph format flag PFE_TABLE
- *   will indicate the the paragraph is a table row.  Note that in this
+ *   will indicate that the paragraph is a table row.  Note that in this
  *   implementation there is one paragraph per table row.
  *
  * Richedit version 4.1:
@@ -37,7 +37,7 @@
  *   each with it's own paragraph format, and cells may even contain tables
  *   nested within the cell.
  *
- *   There are is also a paragraph at the start of each table row that contains
+ *   There is also a paragraph at the start of each table row that contains
  *   the rows paragraph format (e.g. to change the row alignment to row), and a
  *   paragraph at the end of the table row with the PFE_TABLEROWDELIMITER flag
  *   set. The paragraphs at the start and end of the table row should always be
diff --git a/dlls/shdocvw/tests/intshcut.c b/dlls/shdocvw/tests/intshcut.c
index bdd6d2be7d8..0b0798ac1f7 100644
--- a/dlls/shdocvw/tests/intshcut.c
+++ b/dlls/shdocvw/tests/intshcut.c
@@ -171,7 +171,7 @@ static void test_NullURLs(void)
 
         hr = urlA->lpVtbl->GetURL(urlA, &url);
         ok(SUCCEEDED(hr), "getting uninitialized URL unexpectedly failed, hr=0x%x\n", hr);
-        ok(url == NULL, "unitialized URL is not NULL but %s\n", url);
+        ok(url == NULL, "uninitialized URL is not NULL but %s\n", url);
 
         hr = urlA->lpVtbl->SetURL(urlA, NULL, 0);
         ok(SUCCEEDED(hr), "setting NULL URL unexpectedly failed, hr=0x%x\n", hr);
diff --git a/dlls/wined3d/directx.c b/dlls/wined3d/directx.c
index d26940600f0..60d77f0c27c 100644
--- a/dlls/wined3d/directx.c
+++ b/dlls/wined3d/directx.c
@@ -3882,7 +3882,7 @@ static void fixup_extensions(WineD3D_GL_Info *gl_info) {
      *  This usually means that ARB_tex_npot is supported in hardware as long as the application is staying
      *  within the limits enforced by the ARB_texture_rectangle extension. This however is not true for the
      *  FX series, which instantly falls back to a slower software path as soon as ARB_tex_npot is used.
-     *  We therefore completly remove ARB_tex_npot from the list of supported extensions.
+     *  We therefore completely remove ARB_tex_npot from the list of supported extensions.
      *
      *  Note that wine_normalized_texrect can't be used in this case because internally it uses ARB_tex_npot,
      *  triggering the software fallback. There is not much we can do here apart from disabling the
diff --git a/dlls/winhttp/tests/winhttp.c b/dlls/winhttp/tests/winhttp.c
index 6ba3a32a7fd..1e50f36810d 100644
--- a/dlls/winhttp/tests/winhttp.c
+++ b/dlls/winhttp/tests/winhttp.c
@@ -267,13 +267,15 @@ static void test_WinHttpAddHeaders(void)
         test_header_name, buffer, &len, &index);
     ok(ret == FALSE, "WinHttpQueryHeaders unexpectedly succeeded, second index should not exist.\n");
 
-    /* Try to fetch the header info with a buffer thats big enough to fit string but not NULL terminator. */
+    /* Try to fetch the header info with a buffer that's big enough to fit the
+     * string but not the NULL terminator.
+     */
     index = 0;
     len = 5*sizeof(WCHAR);
     memcpy(buffer, check_buffer, sizeof(buffer));
     ret = WinHttpQueryHeaders(request, WINHTTP_QUERY_CUSTOM | WINHTTP_QUERY_FLAG_REQUEST_HEADERS,
         test_header_name, buffer, &len, &index);
-    ok(ret == FALSE, "WinHttpQueryHeaders unexpectedly succeeded with a buffer thats too small.\n");
+    ok(ret == FALSE, "WinHttpQueryHeaders unexpectedly succeeded with a buffer that's too small.\n");
     ok(memcmp(buffer, check_buffer, sizeof(buffer)) == 0,
             "WinHttpQueryHeaders failed, modified the buffer when it should not have.\n");
     ok(len == 6*sizeof(WCHAR), "WinHttpQueryHeaders returned invalid length, expected 12, got %d\n", len);
@@ -289,7 +291,7 @@ static void test_WinHttpAddHeaders(void)
     ok(len > 40, "WinHttpQueryHeaders returned invalid length: expected greater than 40, got %d\n", len);
     ok(index == 0, "WinHttpQueryHeaders incorrectly incremented header index.\n");
 
-    /* Try with a NULL buffer and a length thats too small */
+    /* Try with a NULL buffer and a length that's too small */
     index = 0;
     len = 10;
     SetLastError(0xdeadbeef);