Dual boot Vista 32-bit and XP 64-bit

Hi,
I own a Presario laptop with Vista basic pre-installed on it. I have created a recovery disk for the same. I partitioned the 160 GB hard disk into 4 40 GB HDD.. and installed XP 64-bit in the last partition.
On doing so, i couldnt log on using Vista... Then I had to re-install Vista using recovery disc. Now I cannot boot with XP 64-bit. I tried VistaBootPRO... But did not come to my rescue ...

Can someone suggest a foolproof method to install Vista 32 bit and XP bit without any hassles? Also, i dont have a Vista installable CD.. Its just a recovery disc...

Please help...