everytime i download something on the internet that is an exe. every time i try to run it i get an error telling me its corrupted so i reinstalled my windows and its still doing it. it just recently started happening last night, one of my friends was telling me i probaly have a bad hard drive but i ran check disk and it had no errors. could i possibly have a bad hard drive,right before i built the system it fell off the top of my case a short fall but it still worked so i figured it was okay. the only way i am able to install anything off the internet is by using the bypass command line. any help would be appreciated.