Change Local Disk C

Hello everyone, I recently run into trouble while installing Windows 7 pro 64 bits in another SSD. Long story short, I change the setups of the old windows I had and now it does not boot from the old one, which I want to revert. I'm a 100% sure that all the files are present and nothing was moved or touched (I just checked it) in the different hard drives I've got , but it's just that now I've got windows in two separte SSD's. My question is, how do I change the Local Disk (C:) for it to be the one I had the original windows, so as to have my OS like before.
No need to say that if the OS i running properly there's no need for it to be better, a lesson I learned the hard way.
Thanks for the help in advance.

Hello pal. Regarding your question I really do not get it. Do you refer to the OS or the type of disk? Anyway its a Windows 7 64 bit Pro in Spanish and the disk I installed it to is a 246 gb SSD from Kingstone. The thing is that I also had installed another OS (the old, the original where there is all my configurations), the same if I'm not mistaken, into a 128 gb SSD from Samsung. The question: can I setup somehow for as to the old drive, Samsung 128 gb ssd, to be again my Local C: Drive, and not the 246 gb SSD?
Thanks for answering. Cheers.

The problem is that now I've got to separate OS and I just need one. Is there a way to manually change the location of the C: Driven? Answering your question, no I did not originally unplugged the original OS but no file was lost or overwritten whatsoever. No type of screen seems to appear to show me from which drive I want to boot though.
Thanks

As soon as I get home I will.
Thanks

Will I be able to move all the data and configuration from the old drive to the new one? I mean, I already installed Windows on the new SSD.