WSUS Updates Slow To Install
When installing Windows Server Update Services 3.0 Service Pack 2, the updater pauses for a long time and nothing appears to happen.
This occurs because the updater is making a backup of the WSUS database. If the database is already quite large, the backup will take some time, perhaps as long as a few hours.
By default the database files are stored at C:\WSUS\SUSDB\UpdateServicesDbFiles. Check the size to be forewarned about the prospect of a lengthy update.