Hi Pochrist, welcome to NST
Keep the two disks connected and attach the third one for Windows 7. Verify that you can still boot XP/Vista first with the third drive attached. Boot from Windows 7 DVD. As long as you select the third disk for Windows 7 during the installation you shouldn't have any problems.


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Why take the risks of accidentally installing to the wrong drive, or the boot files of Win 7 going to the wrong disk?
He can use his Win 7 bootloader to boot all 3, if he puts his Win 7 drive first in the BIOS drive order, ya know...
That's what the forums are for. But regardless, I'm glad he got his problem fixed...despite having followed your method! 
