How do I fix a bad Windows installation in Ubuntu?

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http://askubuntu.com – Basically, there was a security issue in the drivers for my graphics card. It was a 64-bit card and I installed 32-bit Windows. Apparently, before SP1 was available, which fixed that issue, 6 trojan horses got in. They stopped SP1 from installing. After going through the ringer several times, I finally talked to a person who knew the problem. It was something about how the drivers tried to transfer between the 32-bit OS and the 64-bit card that left me open. Ever since, my computer has been slow and has had weird issues. Like tinypic wouldn't ever load. Also, certain programs wouldn't instal (HowTos)