I have an e-machine I bought in 2006.
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Windows Live One Care has a free online scan and repair tool, and also offers a 90 day free trial download:
http://onecare.live.com
PC Tools Anti Virus is a free download and does quite well.
http://www.pctools.com/free-antivirus/?utm_source=download.com&utm_medium=product&utm_campaign=av
Hope this helps! Good Luck!