windows 7 on Intel Mac Pro 2006

Here is the problem. I have tryed to install windows 7 on bootcamp on Intel Mac Pro 2006 - 2007. It looks like windows 7 is not supported by this Mac Pro 2006. So right now I'm stuck in windows mode that say try to reinstall Windows.

here is the message "windows failed to start/hardware or software change might be the cause. To fix the problem:
Insert your windows installation disc and restart click to repair"

I can't go back to Mac OS. This is what I have tryed:
1. totally power off, and then restart - it goest to bootcamp again .. constanly rebooting
2. have disconnected that windows hardrive where my windows only was. I have 2 hardrives one for Mac and the other Windows XP...well use to be - in this case it doesn't boot anywere... just grey screen.
3. have inserted MAC OS disc in hope it will somehow reboot in Mac (Snow Leopard)... nothing
Any help please here

Please check out the suggestions in this thread - they may help: http://www.mac-forums.com/forums/os-x-operating-system/198850-mac-book-reinstall-failing.html

Do you have the original OSX disc that came with your MBP? I would definitely try that as well. Are you getting anything when you put your SL disc into the drive? The chime?

Good luck

To the OP:

Reboot your Mac Pro and hold down the "option" key. The OS X hard drive should appear, press enter. If that doesn't work, you may have overwritten the boot sector on your Mac drive while installing XP on the second drive.

However, booting with the Snow Leopard DVD should work. Again, hold down the option key after you hear the POST chime. An image of the DVD should appear, press enter.

Regards.

Reboot your Mac Pro and hold down the "option" key. The OS X hard drive should appear.... Thanks guys, this helps!!!
I got into Mac again .
Now I have to format my windows hardrive and get back to Windows XP since Windows 7 is not an option on my Mac Pro 2x2.66 GHz Dual-Core Intel Xeon