Replace Disk 1 With Disk 0 In Computer Management?

Its a bit complicated to state my situation, anyways, I have 2 HDD, and the PC won't boot if I removed the old HDD even though I've formatted the old HDD and win7 is on the new HDD.I have 2 physical HDD in PC

(1) 80GB old hdd and noisy. (not SATA)
(2) 500GB SATA hdd and sexy.

My powersupply only supports 1 SATA connection, and I don't have a DVD-Rom.I've unpluged the (2) and replaced it with my dad's SATA DVD-Rom to clean install Win7 64bit on the old (1), after I've finished, I removed the SATA DVD-Rom, I plugged back the (2), installed Win7 64bit ISO again from the (1) on (2), then I organized everything and split the (2) to E: and F:.

Everything's fine until I wanted to remove the old noisy hdd. When I did that, the PC started to bitch on me and didn't want to boot from (2).I've tried to rename (2)'s letter to C:, but it gave me 'invalid parameter' error. I doubt that it'll work by itself since it'll need to rename all the softwares' locations and stuff.so I went through another way, renaming (1) to a random letter like K: and wishing that'll work, I've restarted, shutdown'ed, and unplugged (1), didn't boot from (2).So it left me with only and only solution is by clean install, -but- I can't do it since I don't have an old dvd-rom nor do I have 2 SATA PSU cables... so I go back to the begging and...know that I have only 1 option by installing the win, is by the iso.

Now, what I'm thinking is that there's a possible way(maybe?) that I can replace Disk 0 box by Disk 1 box.Here's a picture to clarify it.So that's it, notice the 2 boxes down there? I'd like to switch Disk 0 by Disk 1 and then remove the old crappy 80gb hdd.