How To Remove The Yellow Stain From...
Food & Drink1 min ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.Are you using Windows 2000?
If so check out the penultimate post on this thread thread relating to a (now deleted) knowledgebase article Q298130.
I posted a suggestion to you earlier, clearly that didn't work... I'd say your PC is infected with a virus that prevents the successful update or installation of virus/spyware programs simply by corrupting most downloads.
I would strongly recommend remotely scanning your PC from one of the anti-virus websites (http://housecall60.trendmicro.com/en/start_corp.asp). These will be up-to-date and not effected by what is already on your system.
Do the same again with this online spyware remover:
http://www.trendmicro.com/spyware-scan/
Make sure you run each scan at least twice... once after a reboot.