This question already has an answer here:
I had a Windows 7/Ubuntu dual-boot set up on my laptop. I deleted Ubuntu, and when I load up my computer, I am now met with a screen displaying the following:
error: no such partition. grub rescue>
How can I have my computer boot straight into Windows 7 again?
Solved: I created a win7 system repair disc using another machine, and fixed the problem using the
bootrec command within command prompt.