Congratulations!!!!!!
You've just viewed our most famous and feared BSOD or Blue Screen of Death.
To improve your knowledge about BSOD visit this
thread
To solve your problem..............
1>Try to boot into safe mode and uninstall any newly installed s/w or driver.........do a CClean..........n c wat happens
If unable to c d windows boot screen,
2>IF system restore is activated in ur pc boot ur PC through XP-CD and go to recovery console and restore last saved recovery point.
3>Take a live distro of any linux..............boot into it.......mount windows partition .........backup data..............Reinstall windows...........
Njoy.......