How to edit boot.ini file in vista?

Techies,

Well, my question goes like this. I deleted all my partitions and installed the fresh copy of Ubuntu in one of the partition i have created. and after that i installed Vista in another partition. The installation went fine for vista. everything was done perfect. but then guess what? when i rebooted the system after installing the Vista, i couldn't find the boot entry for Ubuntu.

I tried to solve the problem, went to many forums but couldnt find the right answer. so please guys please tell me how do i solve this problem.

Thanks.