I just installed Windows Vista Business edition via bootcamp (I have a a new 2.8 iMac with the nvidia videocard). At first everything worked fine. I downloaded AVG antivir and Comodo personal firewall and installed all of the updates. Today I turn on the computer and start installing Halo 2 (real version, not pirated). I tried to open Chrome/Firefox and got an error message saying I didn't have access to the file and didn't have the required permissions (I didn't get a screenshot, but can try to if that would help). In fact I tried to open some other program, but nothing would open: comodo firewall firefox, digsby, VLC player. Any ideas or suggestions?