I installed MalwareBytes (paid version) a few days ago. I invoked a scan which immediately informed me that I had 1 infection. The scan took a long time. After three hours I finally went to bed, allowing the scan to proceed without me. In the morning, the computer was "froze." I struggled trying to unfreeze the computer. I could not access TaskManager. I could not invoke CTRL-SHIFT-ESC or Windows-R. Everything I clicked on immediately grayed out and went to "Not responding." I could not do a soft shut down. I had to hard shut down each time. I finally started in Safe Mode, went to MS Config and disabled everything in Services that was not Microsoft. I also disabled everything in the Start that was not Microsoft with the except of McAfee. I restarted the computer and it worked fine. Since installing malwarebytes was one of the last things I did before the computer went crazy on me, I naturally blamed the program. However, after looking at this forum for a couple of hours, maybe that is not the case. I uninstalled the software and was ready to ask for a refund, but I want to be fair and see what the real problem is before I abandon the ship. Any suggestions as to how to proceed? Thanks in advance. Vista 64bit Ultimate SP2 (build 6002), 8 gigs RAM (4 Sticks matched 2gb Ram), KA3MVP, AMD Athlon 64 X2 6000+ (3.0GHtz), 1.5 TB Seagate Free Agent Ext HD (NTFS), 500 GB ST3500630AS Int HD (NTFS), SATA LITE-ON DVDRW LH, NVIDIA GeForce GTS 250 1 gb, McAfee, Windows Defender, Avanquest Double Anti-Spy, productivity software. Belarc Advisor (version 7.2x, 12/12/2009 11:10:35 pm) reports that Virus Protection and Microsft Security Updates are all up to date and working fine.