diff --git a/dll/win32/userenv/CMakeLists.txt b/dll/win32/userenv/CMakeLists.txt
index 28b272697b5..8e372f16001 100644
--- a/dll/win32/userenv/CMakeLists.txt
+++ b/dll/win32/userenv/CMakeLists.txt
@@ -24,6 +24,6 @@ add_library(userenv MODULE
 
 set_module_type(userenv win32dll)
 target_link_libraries(userenv uuid)
-add_importlibs(userenv advapi32 user32 msvcrt kernel32 ntdll)
+add_importlibs(userenv advapi32 advapi32_vista user32 msvcrt kernel32 ntdll)
 add_pch(userenv precomp.h "${PCH_SKIP_SOURCE}")
 add_cd_file(TARGET userenv DESTINATION reactos/system32 FOR all)
diff --git a/dll/win32/userenv/registry.c b/dll/win32/userenv/registry.c
index a7fc4fee49c..326832a1164 100644
--- a/dll/win32/userenv/registry.c
+++ b/dll/win32/userenv/registry.c
@@ -29,6 +29,8 @@
 #define NDEBUG
 #include <debug.h>
 
+LSTATUS WINAPI RegCopyTreeW(_In_ HKEY, _In_opt_ LPCWSTR, _In_ HKEY);
+
 /* FUNCTIONS ***************************************************************/
 
 static
@@ -38,7 +40,6 @@ CopyKey(HKEY hDstKey,
 {
     LONG Error;
 
-#if (_WIN32_WINNT >= 0x0600)
     Error = RegCopyTreeW(hSrcKey,
                          NULL,
                          hDstKey);
@@ -49,229 +50,6 @@ CopyKey(HKEY hDstKey,
     }
 
     return TRUE;
-
-#else
-    FILETIME LastWrite;
-    DWORD dwSubKeys;
-    DWORD dwValues;
-    DWORD dwType;
-    DWORD dwMaxSubKeyNameLength;
-    DWORD dwSubKeyNameLength;
-    DWORD dwMaxValueNameLength;
-    DWORD dwValueNameLength;
-    DWORD dwMaxValueLength;
-    DWORD dwValueLength;
-    DWORD dwDisposition;
-    DWORD i;
-    LPWSTR lpNameBuffer;
-    LPBYTE lpDataBuffer;
-    HKEY hDstSubKey;
-    HKEY hSrcSubKey;
-
-    DPRINT ("CopyKey() called\n");
-
-    Error = RegQueryInfoKey(hSrcKey,
-                            NULL,
-                            NULL,
-                            NULL,
-                            &dwSubKeys,
-                            &dwMaxSubKeyNameLength,
-                            NULL,
-                            &dwValues,
-                            &dwMaxValueNameLength,
-                            &dwMaxValueLength,
-                            NULL,
-                            NULL);
-    if (Error != ERROR_SUCCESS)
-    {
-        DPRINT1("RegQueryInfoKey() failed (Error %lu)\n", Error);
-        SetLastError((DWORD)Error);
-        return FALSE;
-    }
-
-    dwMaxSubKeyNameLength++;
-    dwMaxValueNameLength++;
-
-    DPRINT("dwSubKeys %lu\n", dwSubKeys);
-    DPRINT("dwMaxSubKeyNameLength %lu\n", dwMaxSubKeyNameLength);
-    DPRINT("dwValues %lu\n", dwValues);
-    DPRINT("dwMaxValueNameLength %lu\n", dwMaxValueNameLength);
-    DPRINT("dwMaxValueLength %lu\n", dwMaxValueLength);
-
-    /* Copy subkeys */
-    if (dwSubKeys != 0)
-    {
-        lpNameBuffer = HeapAlloc(GetProcessHeap(),
-                                 0,
-                                 dwMaxSubKeyNameLength * sizeof(WCHAR));
-        if (lpNameBuffer == NULL)
-        {
-            DPRINT1("Buffer allocation failed\n");
-            SetLastError(ERROR_NOT_ENOUGH_MEMORY);
-            return FALSE;
-        }
-
-        for (i = 0; i < dwSubKeys; i++)
-        {
-            dwSubKeyNameLength = dwMaxSubKeyNameLength;
-            Error = RegEnumKeyExW(hSrcKey,
-                                  i,
-                                  lpNameBuffer,
-                                  &dwSubKeyNameLength,
-                                  NULL,
-                                  NULL,
-                                  NULL,
-                                  &LastWrite);
-            if (Error != ERROR_SUCCESS)
-            {
-                DPRINT1("Subkey enumeration failed (Error %lu)\n", Error);
-                HeapFree(GetProcessHeap(),
-                         0,
-                         lpNameBuffer);
-                SetLastError((DWORD)Error);
-                return FALSE;
-            }
-
-            Error = RegCreateKeyExW(hDstKey,
-                                    lpNameBuffer,
-                                    0,
-                                    NULL,
-                                    REG_OPTION_NON_VOLATILE,
-                                    KEY_WRITE,
-                                    NULL,
-                                    &hDstSubKey,
-                                    &dwDisposition);
-            if (Error != ERROR_SUCCESS)
-            {
-                DPRINT1("Subkey creation failed (Error %lu)\n", Error);
-                HeapFree(GetProcessHeap(),
-                         0,
-                         lpNameBuffer);
-                SetLastError((DWORD)Error);
-                return FALSE;
-            }
-
-            Error = RegOpenKeyExW(hSrcKey,
-                                  lpNameBuffer,
-                                  0,
-                                  KEY_READ,
-                                  &hSrcSubKey);
-            if (Error != ERROR_SUCCESS)
-            {
-                DPRINT1("Error: %lu\n", Error);
-                RegCloseKey(hDstSubKey);
-                HeapFree(GetProcessHeap(),
-                         0,
-                         lpNameBuffer);
-                SetLastError((DWORD)Error);
-                return FALSE;
-            }
-
-            if (!CopyKey(hDstSubKey,
-                         hSrcSubKey))
-            {
-                DPRINT1("Error: %lu\n", GetLastError());
-                RegCloseKey (hSrcSubKey);
-                RegCloseKey (hDstSubKey);
-                HeapFree(GetProcessHeap(),
-                         0,
-                         lpNameBuffer);
-                return FALSE;
-            }
-
-            RegCloseKey(hSrcSubKey);
-            RegCloseKey(hDstSubKey);
-        }
-
-        HeapFree(GetProcessHeap(),
-                 0,
-                 lpNameBuffer);
-    }
-
-    /* Copy values */
-    if (dwValues != 0)
-    {
-        lpNameBuffer = HeapAlloc(GetProcessHeap(),
-                                 0,
-                                 dwMaxValueNameLength * sizeof(WCHAR));
-        if (lpNameBuffer == NULL)
-        {
-            DPRINT1("Buffer allocation failed\n");
-            SetLastError(ERROR_NOT_ENOUGH_MEMORY);
-            return FALSE;
-        }
-
-        lpDataBuffer = HeapAlloc(GetProcessHeap(),
-                                 0,
-                                 dwMaxValueLength);
-        if (lpDataBuffer == NULL)
-        {
-            DPRINT1("Buffer allocation failed\n");
-            HeapFree(GetProcessHeap(),
-                     0,
-                     lpNameBuffer);
-            SetLastError(ERROR_NOT_ENOUGH_MEMORY);
-            return FALSE;
-        }
-
-        for (i = 0; i < dwValues; i++)
-        {
-            dwValueNameLength = dwMaxValueNameLength;
-            dwValueLength = dwMaxValueLength;
-            Error = RegEnumValueW(hSrcKey,
-                                  i,
-                                  lpNameBuffer,
-                                  &dwValueNameLength,
-                                  NULL,
-                                  &dwType,
-                                  lpDataBuffer,
-                                  &dwValueLength);
-            if (Error != ERROR_SUCCESS)
-            {
-                DPRINT1("Error: %lu\n", Error);
-                HeapFree(GetProcessHeap(),
-                         0,
-                         lpDataBuffer);
-                HeapFree(GetProcessHeap(),
-                         0,
-                         lpNameBuffer);
-                SetLastError((DWORD)Error);
-                return FALSE;
-            }
-
-            Error = RegSetValueExW(hDstKey,
-                                   lpNameBuffer,
-                                   0,
-                                   dwType,
-                                   lpDataBuffer,
-                                   dwValueLength);
-            if (Error != ERROR_SUCCESS)
-            {
-                DPRINT1("Error: %lu\n", Error);
-                HeapFree(GetProcessHeap(),
-                         0,
-                         lpDataBuffer);
-                HeapFree(GetProcessHeap(),
-                         0,
-                         lpNameBuffer);
-                SetLastError((DWORD)Error);
-                return FALSE;
-            }
-        }
-
-        HeapFree(GetProcessHeap(),
-                 0,
-                 lpDataBuffer);
-
-        HeapFree(GetProcessHeap(),
-                 0,
-                 lpNameBuffer);
-    }
-
-    DPRINT("CopyKey() done\n");
-
-    return TRUE;
-#endif
 }