I don't know about Windsows 7 but I was having a lot of problems with it in Vista. It was slowing down my internet a lot for some reason and I didn't know how to fix the problem so I just gave up.
Now I'm using AVG Antivirus + Firewall. I heard good things about it and from what I've seen it's pretty smooth. I also started using Malwarebytes Anti-Malware to go with it after seeing this thread(thanks for the suggestion Peat Moss)
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