Try unplugging both hard drives from your mobo and restart the pc. Let it throw the NTLDR not found error. Restart and then go into your BIOS. Whatever option it is to reload or save with optimized settings and then save on exit. Shut down and then just install the OS hard drive. Turn it back on and see if it loads windows. After it successfully loads, shut down and install the 2nd hard drive. If the system crashes, the 2nd drive could need a reformat.
If that doesnt work, try installing your OS drive on another computer as a slave, or thru an IDE to USB connector and verify the contents of the drive. When the system froze, it could have damaged your MBR and you could be stuck with no option but to reformat and start over.
Anything more beyond that is beyond my firsthand experience and i would leave it to someone else to give their input before formatting, although from my experience, sometimes its just faster to reformat and start fresh than to try and recover from a critical error like the one you explain.