Windows 7 wont boot, noosinstalled error

[ganon11000]

Hello,
i had a installation of windows 7 64bit until I changed the pc name to monster-pc and installed a update, which somehow corupeted the regestery after doing 10+ start-up repairs (all failing) i decided to get a spare HDD and use xp on it, and try to fix the regestery files, which didn't work and now it has no BCD and says Noosinstalled when i use start-up repair & nothing i do works (I have all my gaming data on this windows 7 hard disk please help!

 

[unksol]

Use a Linux live CD or ubcd4win to backup your data, or if your XP install was successful just use that. Then reinstall windows 7