Windows Vista: Vista Dual boot Problem help

Vista Dual boot Problem help

Ok so I have a Lenovo 3000 N200 0769a8u notebook which came with a preinstalled vista business (32bit). I wanted to put a 64 bit OS on there, so i partitioned the hard drive and installed Vista Ultimate on the second partition. I was thinking you know I would be able to use both OS's. But once i installed the Ultimate, i can't boot into the Business edition. When the notebook starts it has a fast loading DOS (thus i can't read what it says) like message which didn't appear before and then it starts to load Ultimate. If i press the lenovo care button which usually allows me to go to a setup and reinstall windows so i can have the computer back to the factory settings. Now when i press it nothing happens. I am thinking that its a problem with the software that allows you to choose the OS. I am pretty sure my other OS is stable and intact, i think if the software just lets me choose between the two OS's it would be superb. Hope you guys can shed some advice.