Blank Screen

Greetings! This is my first post. On my desktop I have 2 hard drives. Windows 7 is on one and then I just installed XP on the second. I downloaded and ran EasyBCD and when I went to clickon the Write MBR button, my screen went blank. It came back once, I tried to click again and it went blank again and has not come back. On the troubleshooter it says " This means that NTLDR was found, but NTDETECT.COM wasn't." I downloaded fix on my laptop to a pin drive but how do I get it on my desktop if the screen is blank? Do I have to do a hard shut down? Thank you so much in advance, Billie