Problem with starting up Windows 7 after instalation of XP on another

Hi. I Have a problem starting up the newest windows after instalation of older windows with dual boot mode. I installed XP 32bit from window7 onto another hard disk. Afterwards, It does't allow me to start Windows7. It freezes at "Verifying DMI pool data". After reading some forums, I might have MBR, BCD or more files damaged. I found some solutions but both systems are on the same hard drive. How am I suppose to fix Windows7 when its on a different hard disk. If I start up XP, I can see hard disk where windows7 is but when I want to open it, it says "D: is not formated". I would to need fix the files so I can boot Windows7 to save some of my stuff. If I need to I can erase XP. Thank you for your time. Mark

Disconnect the XP drive, boot the system using the Windows 7 disk, select repair Windows and fix the boot loader.
Older OS should always be installed first, in your case XP, then W7.
You could fix XP by disconecting the Windows 7 drive and booting with XP disk and repairairing the XP boot loader.
You then have a choice to use one or the other OS by selecting the drive from bios as the first boot drive (after reconnectng the drive), otherwise, set the CD/DVDRom drive as first boot, the XP second, boot the W7 DVD, run setup, go to drive tools, format the W7 drive and reinstall W7.

Hey
I don't know why but i was think W7 RC don't have repair option on instalation DVD disk. I don't go over first screen which say "instaling windows" before. Now i find this option if i boot from W7 RC instaling DVD and then i use startup repair tool for repair HDD. Partition informations been corupted. I run self repair twice and finaly W7 startup.
And yes i will switching systems in BIOS now. Thank you for concern to help me.
Mark

Thanks for posting back, I'm glad you are up and running.