I have tried a number of commands to try and reset my registry and or fix the hard drive, including bootrec and chkdsk commands that have done their job for over a day scanning the harddrive for bad sectors. I now try to boot my system and get the following error. "Shellhelper.exe - Application error. The exception unknown software exception (0xe0434352) occured in the application at location 0x000000007673DDC2)" and nothing else will load. Ctrl + Alt + Delete has no output. Don't know the following steps I should take to fix.