This is a generic answer, but have you ran Ad-Aware and Spybot on it? Spyware and Adware will cause a PC to slow down exponentially, but it doesn't typically cause start-up issues. Just a suggestion!
-Lasereth
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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