Today I came across a WSUS problem…
After having some problems with the install of WSUS 3.0 SP1 i was not able to uninstall it and hence not reinstall it. I found this article on the WSUS Support team Blog Site.
Link:
http://blogs.technet.com/sus/archive/2008/11/05/how-to-manually-remove-all-of-wsus.aspx