You confuse me a little.
Access to BIOS should be available as soon as the PC is turned on by pressing <Delete>. You don't need to boot the PC to achieve this; you don't even need any dives/cards installed - just the motherboard.
If you can't access BIOS by pressing <Delete>, you could try resetting to default by removing the CMOS battery. It could be a good idea to fit a new item at the same time as a low CMOS battery can cause 'interesting' faults.
Another trick is to hold a keyboard key down when you switch on the PC as this can give a 'stuck key' indication and an option to go into BIOS.
You should also use only a PS2 keyboard and mouse as often USB items are 'inert' until system boot is achieved.
For your NTDLR problem click here
For the MBR problem click here
Hope this helps.