This is a known issue. Microsoft provided a hotfix: https://connect.microsoft.com/VisualStudio/Downloads/DownloadDetails.aspx?DownloadID=11399
Install VS2008 SP1 should also fix this problem. http://www.microsoft.com/downloads/details.aspx?FamilyId=FBEE1648-7106-44A7-9649-6D9F6D58056E&displaylang=en