XPP - Windows Update runs, but download hangs

Hi,

I am working on an XPP PC that was trashed by viruses and spyware. I
removed several thousand infected files and eventually had to do a
Repair Install (SP2). I also had to forcibly remove NIS 2004.
Everything works fine now and virus & spyware scans are clean. When I
run Windows Update it gets to the point where downloads commence, then
the download monitors appears to hang. Nothing is downloaded. The
TaskMgr says it's running, but nothing is being downloaded. I have to
kill it will the TaskMgr to get rid of it. Any assistance will be
appreciated.

Thanks,

Tom