I've looked through the guides posted in this forum on how to remove different spyware/trojans/viruses/etc., but I'm not exactly certain which of these I have, in order to start removing it. Basically, right now my computer is running really slowly, but I'm not getting a ton of the pop-ups I've read other people have. I had previously been running Norton Internet Security 2008, and was regularly updating it. In addition, I was regularly running Spybot-S&D, and was regularly updating that. I don't know how a virus could have gotten in (I've wondered if it's been through email, since when I upgraded to Norton 2008, it wouldn't mesh with my Outlook Express--which meant I no longer have a working Norton Antispam folder, and all the junk mail comes to my regular inbox), but I do have a virus. I have downloaded just about every spyware removal program I've seen recommended on these boards (from the links provided), but none are recognized by windows any longer. Basically, I get "... is not a valid win32 application." This goes for Norton as well, as it no longer loads when the computer boots, and I therefore tried and open it through the .exe file. I've tried online virus checker/removers, but most error out.
Any recommendations would be VERY appreciated.