Dude, are you sure about this. I have never had this sort of thing happen before. Then again, I run on Ubuntu Linux and not Windows so the way McAfree works with Ubuntu might be diffent.
What softwares were removed? What system environment are you running? What Brand is your computer? When did you get the computer? Are all your updates installed? Did you have a trogan or virus before the installation of Mcafee? Do you have other security programs on your computer?
Have you had any other security or programs that deal with crucial files in the past?
All of these questions above are crucial we cannot answer you until you state some or all of these. Thank you! I havnt heard of this problem either except for Kapersky sometimes doing it. Some antiviruses will work on YOUR computer and might not work on others... it all depends on how your computer is set up and how organized it is. McAfee is an awsome program it came with my computer for free and i thought it wouldnt work.... then it worked lol I used to use avast because it was free but Mcafee the way to go man....