Last night, McAfee found this "Spy-agent.bw!mem" in these files: ntos.exe, sdra64.exe, twex.exe, twext.exe, winlogon.exe. It would list the first three as removed, ask what action to take with the fourth one, and say something like "quarantine terminated" for the third one. After a second and third scan, the same list appeared.
Today, my computer will power up, show my desktop background then come back to the welcome-please sign into you account screen. When I click on my account, it says logging in, then immediately says logging off. If I click again, it will do the same thing.