I walked into a customer yesterday that had 5 computers locked up directly logging in. I had another customer who had one PC with the same symptoms. I was able to power off the computer, go to safemode, and boot with different parts of the system by using MSCONFIG. I finally found that if I disabled MBAMGUI (MalWareBytes) from the Startup Tab I was good. These computers where running MWB 1.60 free version (one full version). It appears that when you are using MWB Full version or the free version with the Trial for the full version the PCs would lock up after login on the desktop. I am also running AVG v9. My coworker had 5 machines in the same situation yesterday too. I tried bypassing pieces of MWB in the AVG scan but havent had any luck. Any suggestions?