+ 0 Votes keep avast PurpleSkys December 7, 2012 at 9:15pm PST install malwarebytes...the two shouldn't conflict at all; I run the two together and have for a number of years. You may also want to install ccleaner first and run it, leave it set on the defaults; it'll clear your cookies and temp files. I would also recommend running all three in safe mode. Afterwards, try to install MSE again. Let us know how it goes.