I have a Vaio laptop with McAfee trial version antivirus. Now, I want to chaange it with another software...but if I try to install a new antivirus, my computer blocks and I must and I must enter safe mode, bring the computer to a previous system configuration (before I installed the antivirus). Should I un-install McAfee first, and then install the new antivirus, or am I forced to keep McAfee and pay the full version??? please help!!!!
