I've tried that

I already set the bios up for it to boot up with cd that is actually how I got the repair option going in the first place. The isass.exe error is the problem, it stops the process and creates a pop up. Soon as the computer boots up it just continues with the restarting of the installation of windows, hangs there and doesn't go anywhere, there is no place to exit the program, and ctrl alt del, don't work. Is there something else I can try? I want to stop the restarting of the installation of windows, and move on to just reinstalling it not repairing it. Thanks in advance...