diff --git a/dlls/wuapi/Makefile.in b/dlls/wuapi/Makefile.in
index 3735adc8136..e870d78b13b 100644
--- a/dlls/wuapi/Makefile.in
+++ b/dlls/wuapi/Makefile.in
@@ -8,6 +8,7 @@ IMPORTS   = uuid kernel32
 
 C_SRCS = \
 	downloader.c \
+	installer.c \
 	main.c
 
 @MAKE_DLL_RULES@
diff --git a/dlls/wuapi/installer.c b/dlls/wuapi/installer.c
new file mode 100644
index 00000000000..1a2c5530a24
--- /dev/null
+++ b/dlls/wuapi/installer.c
@@ -0,0 +1,253 @@
+/*
+ * IUpdateInstaller implementation
+ *
+ * Copyright 2008 Hans Leidekker
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#define COBJMACROS
+
+#include "config.h"
+#include <stdarg.h>
+
+#include "windef.h"
+#include "winbase.h"
+#include "winuser.h"
+#include "ole2.h"
+#include "wuapi.h"
+
+#include "wine/debug.h"
+
+WINE_DEFAULT_DEBUG_CHANNEL(wuapi);
+
+typedef struct _update_installer
+{
+    const struct IUpdateInstallerVtbl *vtbl;
+    LONG refs;
+} update_installer;
+
+static inline update_installer *impl_from_IUpdateInstaller( IUpdateInstaller *iface )
+{
+    return (update_installer *)((char *)iface - FIELD_OFFSET( update_installer, vtbl ));
+}
+
+static ULONG WINAPI update_installer_AddRef(
+    IUpdateInstaller *iface )
+{
+    update_installer *update_installer = impl_from_IUpdateInstaller( iface );
+    return InterlockedIncrement( &update_installer->refs );
+}
+
+static ULONG WINAPI update_installer_Release(
+    IUpdateInstaller *iface )
+{
+    update_installer *update_installer = impl_from_IUpdateInstaller( iface );
+    LONG refs = InterlockedDecrement( &update_installer->refs );
+    if (!refs)
+    {
+        TRACE("destroying %p\n", update_installer);
+        HeapFree( GetProcessHeap(), 0, update_installer );
+    }
+    return refs;
+}
+
+static HRESULT WINAPI update_installer_QueryInterface(
+    IUpdateInstaller *iface,
+    REFIID riid,
+    void **ppvObject )
+{
+    update_installer *This = impl_from_IUpdateInstaller( iface );
+
+    TRACE("%p %s %p\n", This, debugstr_guid( riid ), ppvObject );
+
+    if ( IsEqualGUID( riid, &IID_IUpdateInstaller ) ||
+         IsEqualGUID( riid, &IID_IDispatch ) ||
+         IsEqualGUID( riid, &IID_IUnknown ) )
+    {
+        *ppvObject = iface;
+    }
+    else
+    {
+        FIXME("interface %s not implemented\n", debugstr_guid(riid));
+        return E_NOINTERFACE;
+    }
+    IUpdateInstaller_AddRef( iface );
+    return S_OK;
+}
+
+static HRESULT WINAPI update_installer_GetTypeInfoCount(
+    IUpdateInstaller *iface,
+    UINT *pctinfo )
+{
+    FIXME("\n");
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI update_installer_GetTypeInfo(
+    IUpdateInstaller *iface,
+    UINT iTInfo,
+    LCID lcid,
+    ITypeInfo **ppTInfo )
+{
+    FIXME("\n");
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI update_installer_GetIDsOfNames(
+    IUpdateInstaller *iface,
+    REFIID riid,
+    LPOLESTR *rgszNames,
+    UINT cNames,
+    LCID lcid,
+    DISPID *rgDispId )
+{
+    FIXME("\n");
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI update_installer_Invoke(
+    IUpdateInstaller *iface,
+    DISPID dispIdMember,
+    REFIID riid,
+    LCID lcid,
+    WORD wFlags,
+    DISPPARAMS *pDispParams,
+    VARIANT *pVarResult,
+    EXCEPINFO *pExcepInfo,
+    UINT *puArgErr )
+{
+    FIXME("\n");
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI update_installer_get_ClientApplicationID(
+    IUpdateInstaller *This,
+    BSTR *retval )
+{
+    FIXME("\n");
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI update_installer_put_ClientApplicationID(
+    IUpdateInstaller *This,
+    BSTR value )
+{
+    FIXME("%p, %s\n", This, debugstr_w(value));
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI update_installer_get_IsForced(
+    IUpdateInstaller *This,
+    VARIANT_BOOL *retval )
+{
+    FIXME("\n");
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI update_installer_put_IsForced(
+    IUpdateInstaller *This,
+    VARIANT_BOOL value )
+{
+    FIXME("\n");
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI update_installer_get_ParentHwnd(
+    IUpdateInstaller *This,
+    HWND *retval )
+{
+    FIXME("\n");
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI update_installer_put_ParentHwnd(
+    IUpdateInstaller *This,
+    HWND value )
+{
+    FIXME("\n");
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI update_installer_put_ParentWindow(
+    IUpdateInstaller *This,
+    IUnknown *value )
+{
+    FIXME("\n");
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI update_installer_get_ParentWindow(
+    IUpdateInstaller *This,
+    IUnknown **retval )
+{
+    FIXME("\n");
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI update_installer_get_Updates(
+    IUpdateInstaller *This,
+    IUpdateCollection **retval )
+{
+    FIXME("\n");
+    return E_NOTIMPL;
+}
+
+static HRESULT WINAPI update_installer_put_Updates(
+    IUpdateInstaller *This,
+    IUpdateCollection *value )
+{
+    FIXME("\n");
+    return E_NOTIMPL;
+}
+
+static const struct IUpdateInstallerVtbl update_installer_vtbl =
+{
+    update_installer_QueryInterface,
+    update_installer_AddRef,
+    update_installer_Release,
+    update_installer_GetTypeInfoCount,
+    update_installer_GetTypeInfo,
+    update_installer_GetIDsOfNames,
+    update_installer_Invoke,
+    update_installer_get_ClientApplicationID,
+    update_installer_put_ClientApplicationID,
+    update_installer_get_IsForced,
+    update_installer_put_IsForced,
+    update_installer_get_ParentHwnd,
+    update_installer_put_ParentHwnd,
+    update_installer_put_ParentWindow,
+    update_installer_get_ParentWindow,
+    update_installer_get_Updates,
+    update_installer_put_Updates,
+};
+
+HRESULT UpdateInstaller_create( IUnknown *pUnkOuter, LPVOID *ppObj )
+{
+    update_installer *installer;
+
+    TRACE("(%p,%p)\n", pUnkOuter, ppObj);
+
+    installer = HeapAlloc( GetProcessHeap(), 0, sizeof(*installer) );
+    if (!installer) return E_OUTOFMEMORY;
+
+    installer->vtbl = &update_installer_vtbl;
+    installer->refs = 1;
+
+    *ppObj = &installer->vtbl;
+
+    TRACE("returning iface %p\n", *ppObj);
+    return S_OK;
+}