I migrated a WSS v3 to Sharepoint Foundation 2010 and all went ok apart from some few errors. I then tried installing a Sharepoint 2010 express search which went ok. But after trying to add the Search Core Result webpart to a search center i got the error : internal server error exception I found a solution here And you can download the hofix here Hope this helps ** TRIED THE HOTFIX BUT STILL DIDN'T FIX IT*** ......