My computer got spyware/Adware and my computer is running very slow? What should I do?

My computer just started getting a ton of ads and then it started running very slow… I have McAfee and the Spyware protection was turned off and I don’t know how, but it was. McAfee also removed several trojans and it said it couldn’t remove some… Please what should I do? I am using my Nintendo Wii to get on the internet since my computer is going so slow. Help would be very appreciated.

This is free and does a lot deeper scan than most.

http://www.superantispyware.com

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