I agree with FlashDude, sounds like you didn't eliminate the problem. If you want to start fresh, you need to format and do a clean install. You may have malware on there that you didn't get rid of. Some viruses and trojans can affect updates. Hit Warez's spyware removal guide and try again.
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If your equation requires either a complex combination of variables to get the desired result OR you can't seem to get the result regardless of the variables....it ain't your variables, it's your constant.