as i plan on adding water cooling/case modds to my v1200 witch would take a few days would it work if i took this hard drive and put it in my pc with old parts and not have to do a new install of windows?
Yes you would need to reinstall IMO. Your current installation has drivers, settings, and hardware profiles specific to your current rig that may come into conflict with the parts of your old system. This results with a very unstable OS or at the very least, a very sluggish OS.
This is weird.. there have been a lot of threads posted in various forums over the last few days asking this same question, and the variety of answers I've seen is amazing...
I agree with Danny, but apparently a repair install is all that's needed to get you running stable again.... never worked for me, but in the OS forum, there are at least a half dozen members who insist it works just fine.... worth a try maybe, you really have nothing to loose by trying...