Just a quick note to say thanks for helping me get my computer back. I had the nasty virus "Security Tool" on my laptop. At first I couldn't download Malwarebytes; even in safe mode and changing the .exe file name. I was finally somehow able to temporarily disable Security Tool myself long enough to download Malwarebytes; ran a quick scan where it found 29 infections. Killed those, started up again and ran a full scan where it found 47 more infections. Re-started and ran the full scan yet again and it found nothing. This was a nasty virus and I'm still not totally convinced it's gone for good, but it seems to be deeply wounded at the very least. Thanks again.