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To expand on what JSWolf said, the lastest version(s) of AVG have been resource hogs, impairing performance in all but the most powerful machines (if they are lightly utilized). Don't merely get rid of AVG (which would leave you unprotected); replace it with something else, such as Microsoft Security Essentials (which is free) or Avast's free version. I use Avast.
You might also consider upgrading your hardware; your's must be getting pretty tired. Win 2000 is no longer being supported by MS, leaving you wide open to any new vulnerabilities that are discovered since MS will not be patching them anymore. If you do upgrade, you might as well upgrade to a machine that will handle Win 7 and get one of the midpriced versions of Win 7 (buy it separately instead of getting it preloaded on your machine; OEM versions are basically one time use only and can't be reused on a new machine or even with a new MOBO in the current machine). That should keep you going for quite a few years.
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