When I tried to install Ad-Aware 11 free, the only option that it gave me was to install in compatible mode. However, I did not have any other virus protection installed. I checked the list of programs on the Ad-Aware website that are incompatible and did not have any of them. I did used to have AVG and Avast so I wasn't sure if there were still some pieces of them lingering around or what was going on. Finally, I guessed that maybe Malwarebytes Anti-Malware was it and uninstalled it and that did the trick. I'm not sure why since Malwarebytes is not an antivirus but a program that cleans up after a virus is already there. My suggestion is to please, please tell the user what program was detected that is incompatible. It would have saved me trying to reinstall four times, two reboots, researching on the internet, and almost walking away from Ad-Aware altogether. Another suggestion is to add Malwarebytes to the list of incompatible programs if it truly is incompatible. Thank you.