Securing my computer on a shared wireless network?

tmreturns

New member
I have a toshiba and am running Windows 7. I share a "secure" wireless network with my roommate. I'm not really worried she'll spy, I'm more worried a virus or something (which she currently has) could get to my computer through hers because I came across a file with her computer login name but I didn't understand why it was there. I want to make it so nothing she does can be seen or exchanged to me and vice versa. Any advice?
 
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