How do I check for viruses, and how do I delete my cookies?

Update your antivirus and run a full scan

If you do not have full time (active) virus protection install (only one) all are excellent:

AVG Antivirus 7.5 Free Edition

http://free.grisoft.com/freeweb.php/doc/...

http://www.download.com/AVG-Anti-Virus-F...

or

Free antivirus - avast! 4 Home Edition

http://www.avast.com/eng/avast_4_home.ht...

or

AOL Active Virus Shield (powered by Kaspersky)

http://www.activevirusshield.com/antivir...

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Install Windows Defender (full time spyware protection)

Perform a full scan in save mode

http://www.microsoft.com/athome/security...

or

AOL Automatic Protection Against Spyware and Malware

http://daol.aol.com/safetycenter/spyware

http://daol.aol.com/safetycenter/

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Install the following five programs and run weekly or at least monthly. You need all five. They will greatly increase your protection. They are not a substitute for full time spyware and virus protection.

Ad-Aware SE Personal (update + full scan)

http://www.lavasoftusa.com/products/ad-a...

Spybot Search %26 Destroy (update + immunize + scan)

Do not enable Tea Timer and SDHelper

After installation: update + scan + immunize

http://www.safer-networking.org/en/mirro...

SpywareBlaster: Update then open and click 鈥渆nable all protection鈥?