All I did was install it and scanned with. it. Then later in the day, I wanted to scan again for the heck of it. That's when I noticed that it would not start up again if I clicked on the Destop Icon. I even clicked on the file in the Malwarebytes folder, and it won't run. If I go into "Task Manager" and look under processes and disable it, then it will run. Then if I exit it again, try and start the program, it still won't run, unless I go into Task Manager and disable it again. My Os is Windows 7 Home Premium, and I run PCTools Firewall. I have the latest version of Malwarebytes, and definitions.