OK so their software isnt working on your system, but when you uninstalled your antivirus their software worked? Correct?
If so then the problem is the antivirus blocking the program, which doesn't surprise me with macfee. I never liked using them and according to av-comparatives.org they are not what they use to be lol
But my repair tool is for fixing windows, wont really help with third party programs unless there is something in windows their program relies on.
What version of macfee do you have installed and does it have a built in firewall?
Shane