Invalid boot.ini

Hello,


Yesterday i tried to reinstall a Bluetooth driver(from lenovo site) on my lenovo 2048 with windows xp sp3 laptop, the system asked to replace those file and to restart system .

But when i restarted the system it shows a message " invalid boot.ini booting from windows"

and then a blue screen comes with some errors which dissapears fastly (cannot read the errors because it goes fast) n then system restarts and repeat the same ,it keeps on restarting .


Kindly give me a solution , i do not want to format bcoz i will lose some important datas

please give me a solution to return my system to the previous stage.


Thanks

Mathew