Can Not Install 3 Security Updates

[Guest]

KB 840315
KB 841873
KB 842773

Can not install these three Windows XP updates released last week. All other updates released before and after have installed successfully.

I have tried manually downloading all three and receive the following error dialog:
"installation did not complete."
Please advise.

 

[Kaylene aka Taurarian]

http://support.microsoft.com/default.aspx?scid=kb;en-us;822798
You Cannot Install Some Updates or Programs “Digital Signature not foundâ€
When you use the Windows Update Web site to install updates, the installation
fails and the Windows Update.log file contains error 80070643.

If the above doesn't help, then I suggest you post to the WU NG stating your OS
and what you've already tried
Communities
http://support.microsoft.com/newsgroups/

KB 840315
KB 841873
KB 842773

Can not install these three Windows XP updates released last week. All other

updates released before and after have installed successfully.