A friend of mine called me over because he was having troubles, and it seems that I cannot run any program (Firefox, avast antivirus, EVERYTHING) and I tried putting malwarebytes on his computer, which I had the install file on my USB drive, it wouldn't open up and install boxes whatsoever. On top of that, I have a Portable Antivirus on my USB drive that is run directly from my USB drive, but double clicking it would not open up anything. I looked at his "Services" and a lot of them are disabled. When I tried to turn on his avast antivirus service, it says access denied. I looked under Computer Management -> Users -> and went to his account, and his account is Enabled. I tried all of these in Safe mode too. There are no odd looking programs and no odd looking startup services or programs under MSCONFIG. I ran AVG rescue disk from a CD on boot and it did not find any viruses. Lastly, I had my computer with me at the time and downloaded a DEFAULT EXE reg file, which supposedly restores the file associations back to normal for .exe files. I ran that but it didn't do anything. He doesn't have his Windows 7 disk anymore, so I can't run a Repair on it. I've literally run out of ideas on what to do next. I'm hoping some of you have suggestions. Remember, he can't go on the internet to download anything, can't run anything already on there, and can't install anything.