812956 Windows Update Scan for Updates Stops Responding at 0%
http://support.microsoft.com/?id=812956
Try downloading the "network install for IT professionals" and running the
full SP install.
http://www.microsoft.com/downloads/details.aspx?FamilyID=1001aaf1-749f-49f4-8010
-297bd6ca33a0&displaylang=en
If that doesn't work, please post the last few lines of the
WindowsUpdate.LOG and SVCPACK.LOG files.
AFAIK, You can get assistance from the following website:
http://support.microsoft.com/default.aspx?scid=/support/email/windowsupdate/wass
ist.asp&LN=EN

Signature
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Daniel Chang
Server Setup Team
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: Update gets as far as "Updating your system", and displays
: a URL that it is trying to connect to. The connection
: never happens, and after a very long delay, it gives up. I
: don't have any connection problems in general... what's up
: with this?