My Computer Crashed!

How do I buy anti virus for my computer?
My computer keeps warning me that i have infected files on it and i want to buy anti virus software to protect it. How do I do it and what are the best types of software?

Check Out:

BitDefender Anti-Virus 2011, 3 Users, 1 Year Subscription (PC)

AVG Internet Security 9.0 (3 User, 2 Year) (PC CD)

Webroot AntiVirus with Spy Sweeper 2010, 3 user (PC)

Kaspersky Anti Virus 2011, 3 PC, 1 Year Subscription (PC)

Kaspersky Anti Virus 2011, 1 PC, 1 Year Subscription (PC)

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