[unknown soldier]

So I don't know if you heard about the possible Eva Longoria sex tape going around but one of my roommates sure as hell did and he downloaded what he thought was it last night. So when he opens it up and it gives him a message saying he needs to update windows DRM so he does. Apparently it went to Microsoft's server, I don't know. At this point another prompt comes up indicating that he needs to download a new license from a different site to acquire the the rights to view it. SO, of course he says yes and when the little window in Media player comes up where its supposed to show you the license it instead has a page not found window. He wrote down the address and tried to view the actual page through Mozilla and again it comes up page not found. Apparently the site to whatever license he tried to download isn't working? I don't know. I talked to one of my friends today and he told me its possible that this could have been a scam to load software on my computer to gain information about the users of the computer. You know, key loggers and maleware to aid in identity theft? So my question is, is that possible? If so how can I clean my computer without flattening my hard drive? I'm extremely paranoid right now and I don't feel my computer its safe anymore to do online banking and those sorts of things.