Dejibo,
Looks like you may have too much(Malwarebytes, AVG, nortons, Prosuite, Combofix...Proscan?) running on your system. Try uninstalling all but just one
antivirus program, preferably just a standalone antivirus program and not some bloated "suite" of programs.
That quad core machine with Windows 7 should be quick and nimble, not bloated & draggy,