Dual boot Vista and Win 2003 Server when Vista is pre-installed

Hello, I’m trying to find out how to dual boot my laptop into either Vista or Win 2003 Server. I have looked at a lot of resource about installing 2003 first then Vista, but the issue is my Vista is pre-installed on my machine and the only way to install again is if I carry out the Vaio recovery system. This means that the laptop is recovered into Vista factory settings and does not recognise 2003 Server even on a seperate partition not touched by the recovery process.

I’ve tried using VistaBootPro 3.2 but it will boot into Vista but not into Server, just tells me that ntldr is missing. I’ve tried re-installing server….but you get the picture, no luck!

Any ideas?

Thanks