My son, who has been up working for nearly 30 hours straight, thought his system was infected with trojan.riler.E -- whatever that is -- and decided to try to edit his reg file to get rid of it, based on some info he found at Symantec.

Now, he can't get back into his system, and he said when he tries to reinstall the system, it shuts down and won't let him.

I'm new enough (still) at this to be a danger. What do I tell him to do? Should he try to reinstall in Safe Mode?