I would turn the preview pane off. Viruses come in email and usually come with names of friends or people you know. If it is first in the list it is already open and too late. Do what Debian recomended in the first reply.

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Intel 6320
4 gigs ddr2 ram
160 gig sata
evga 8800 gts video card
vista home premium sp1 - 64 bit