we need a bit more info in order to us to help you out. do you get any errors?
if your internet is working fine, then check out www.majorgeeks.com and click on the spyware section on the left hand side. then download both spybot and adware SE, install them on your computer, update them, and run both spybot and adware SE. see if they detect spyware and let them get rid of it.
i also recommend an online virus scan from trend-micro's website:
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