Is your system crashing after having just installed a new hard drive in your Windows 7 computer? Crashes typically occur when resuming from sleep mode and I recently had this issue after I moved my system over from a small hard drive to a much larger Western Digital 2Tb drive (See here). After much searching, I figured out what the problem was and that (luckily for me) Windows 7 provided an easy fix. The problem has to do with really large hard drives 1Tb and above. See below for a solution to this problem.
The problem: When waking from sleep mode, a blue screen appears.
Why this occurs: When Windows is in sleep mode, the drive shuts down. When your system comes out of sleep mode, the drive turns back on and spins up. The larger drives take longer to come on and Windows times out before the drive is finished–resutling in a blue screen.
The solution: Windows provides a hotfix for this that can be downloaded and installed. See Microsoft support here for the hotfix.
Since installing the hotfix, my computer has worked perfectly!
I hope this helps others.
As always back to mechanical engineering and product design!