My son's computer infected with something. The desktop is blank and the start menu is blank. I'm afraid to attach it to my network so I've copied mbam and the rules.def to a flash drive with the write switch set to disabled. Toward the end of the installation of mbam, I receive a dialog box with "Access denied"; title is "Setup". I would appreciate any guidance you might be able to provide. I can connect it to the network if needed but would prefer to copy all the files to a flash drive and keep it off the network for now.