alright update and all fixed.
I had loads of issues reinstalling windows.
After reading around on loads of forums.
I found out I had to pull out all other hard drives i wasnt using (even though I didnt need to do this on the install the other day).
I was installing off a usb stick.
but it wouldnt let me write windows to the drive today.
so I had to write windows to a cd, then boot off that.
after that and loading the drivers it all worked fine
(although its a shame windows 7 doesnt come with the nforce4 drivers, as ubuntu does.).
either way the reinstalled fixed the boot issue.