Hmmm, people going to some pretty serious stuff pretty fast. All to someone who doesn't really know enough to be doing that. And saying to someone, "Are you browser jacked", when they have just said "I have broadband, what else is there to know" (no offence).
Have you done the really basic stuff, that everyone should done every few weeks or months?
Delete temporary internet files and saved passwords, both Internet Explorer and Firefox. Run the clean-up software that comes with xp/vista or 7?
Use some additional spyware software (adaware, spybot, spyware blaster...windows defender) as apposed to just running the anti-virus you have.
Update the anti-virus/spyware software. Update your operating system, XP/Vista/7.
Start slow and really basic.