My son has a Toshiba Satellite L305 laptop running Windows Vista. I don't know what he did but the system does not recognize .exe files, therefore no application works and I can't even reinstall Windows. I'm assuming he has a virus but cannot prove it since AVG won't run. I also tried to install Ubuntu, but the computer will not recognize the .exe file to open infra recorder. If anyone has any suggestions on how I can fix this problem I would appreciate it.