Some people trying to install Ubuntu 10.10 side by side with Windows 7. When you found Windows 7 crash, bellow some possible to solve the propblems :
https://help.ubuntu.com/community/Gr...0from%20LiveCD
http://ubuntuforums.org/showthread.php?t=1437155
Boot from your Windows repair disc/system disc/recovery disc and choose repair your computer. It probably won't fix it but then go to the command prompt and type
bootrec.exe /fixmbr and hit enter then type
bootrec.exe /fixboot and hit enter.
Reboot and hopefully Windows will boot again.