If you see Internet pop-up claiming you have a virus or spyware just close it out. It is a trick to get you to click on a button and download a program which will cause actual problems.
You may also want to make note of what AntiVirus you use at home and inform your household not to trust any internet pop-up.
I've seen 3 incidents in a week. They were the same Malware but have different names "Antivirus XP", "AntiVirus 2008", and "AntiVirus 2009". They can really make a mess of things so watch out.
For some precaution I'd also download spybot at home, update it and immunize your system.
Here is a link:
http://fileforum.betanews.com/detail/Spybot_Search_and_Destroy/1043809773/1
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