When I installed Backtrack 5 R3 I chose to dual boot, and it completely erased my bios and installed GNU Grub as the first thing that shows up when I boot up. The "Press escape for startup options" still shows but if I press escape it says bios is missing or corrupted. I would like to boot to the windows installer from my USB stick (Testing out windows 10), remove GNU Grub, and flash back my bios while still being able to dual boot to Backtrack 5 R3.