Windows Update Troubleshooter http://v4.windowsupdate.microsoft.com/troubleshoot/
Download stops or freezes. The Windows Update - Web Page Dialog window appears
but download never starts
Win2000, Win98 and Win98 SE, WinME, WinXP
http://support.microsoft.com/default.aspx?scid=kb;en-us;822798
You Cannot Install Some Updates or Programs "Digital Signature not found"
When you use the Windows Update Web site to install updates, the installation
fails and the Windows Update.log file contains error 80070643.
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