I should have run MalwareBytes first without shutting down the computer, for when I did it would not boot completely into any mode. It just goes really, really slow, but doesn't work hard or bring up the fan. It looks like the Microsoft progress histogram thing that appears before login is fake, but I could be wrong about that. I tried the built in quick scan which is not up-to-date, and did not find anything.
Forgot to say: On 1st attempt to boot the computer went into System something(?) and I tried this again another time. It stayed on about 15 minutes each time, then completed, but could not read what it said it had found as it flashed by. After that, attempts to boot got to the login within 5 minutes but would not finish after login.
Although I think it would be possible to use the Lenovo One-Step utility to restore to factory default, there is reams of work that is extremely difficult to save and concerning which I have been unable to find a less time-consuming way to keep up with saving it. The larger part, unsaved, has been accumulating since July and it would be terrible to lose it.
The computer is a Lenovo G550 laptop with Windows 7 Home Premium and 200 GB Hitachi hard drive. The Intel works has built in graphics.
Edited by Queen-Evie, 12 March 2016 - 12:53 AM.
moved from Windows 7 to Am I Infected