I have installed Xp and vista into my laptop. suddnely some virus has spred on xp. I Formate it and reinstalle the Xp. but i coudnt go back to vista becuase boot loader dsnt apper. So i Updated the boot loader from vista. then only vista came.
then i agon repair Xp and got xp only. i try to make a boot loader using XP. but when i made it. it sayas some files are missing.
Can i do this without any fomatting to my vista partition ?

I came across this article on how to recover the boot loader:
http://neosmart.net/wiki/display/EBCD/Reco...er+with+EasyBCD
Here is the download link for EasyBCD:
http://neosmart.net/dl.php?id=1
if that doesn’t work, then you can format your entire hard drive and reinstall XP first, and then Vista second; also make sure that you backup all your data before trying any solutions.

Thank you for your help dear

Read:
http://www.suggestafix.com/index.php?showtopic=25068

you can go over the top and repair the loader!!