Vista deleted bootloader.. how to get it back?

Hi,

I installed Linux Mint - 6 on a new computer. .. worked fine..
after that .. I installed Vista on another partition, but it deleted the entry in boot loader. there is noting on linux in vista boot loader.
Can some one tell me how to boot in Linux Mint 6 again.. without loosing that partition n going through installation again?
please help .. I know this is a noob question..

Regards .. please help

,.