To workaround the subject behavior:

1. Open a CMD.EXE window.

2. Type the following commands, pressing Enter after each line:

net stop cryptsvc
del /q %systemroot%\system32\catroot2\Edb*.log
del /q %systemroot%\security\Edb*.log
net start cryptsvc
4. Visit the Windows Update Web site to update the computer to Windows XP SP2.