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Where can i find those? Are they free?

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google: AVG antivirus .. then Zonelabs firewall

then go to microsoft.com and search for antispyware and download / run that thing

then go to download.com and get ad-aware

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My PC is not very good. Will all this stuff slow it down?

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quite all other applications before downloading and running these. In the end, your comp. will run a lot smoother and will be more secure.

Oh, and defragment your harddrive once in awhile.