Having boot lockup day after I installed and ran MBAM. Avast AV 4.8 was running when I installed MBAM--no problem, but next boot froze with both Avast and MBAM running in real-time protection mode. Could not even turn off computer at on/off button, but had to use power switch on surge protector and start in safe mode with F8, then Restore to a point before MBAM was installed. I may uninstall Avast and try one of the programs that seem to be compatible, then install MBAM again. If I have any more trouble then, well, I guess I have just had a $25 lesson.