error 0_ in bottom right after changing msconfig

Hi, I got a virus on Windows 7 and tried to boot up in safe mode by changing MSCONFIG

Since checking "start in safe mode" it stopped booting up - it doesn't boot with windows DVD or bootable USB (I have made sure to change settings in BIOS to boot from these devices first)

It displays 0_ in the bottom right corner and goes no further. I believe the 0_ relates to intel motherboard.....

I have an i7 processor - not sure about the rest of the specs as a friend built this, is there any way I can find the specs from BIOS?

Anyone with any ideas how to fix this?

Thanks