Vista - Driver or hard drive problem

A couple of days ago I took a SATA hard drive from another computer and
installed it on this computer. I hot plugged it in and everything went
well. Assigned G & L and showed up in Computer and was viewable in
explorer normally.
I decided I wanted to keep my hard drives sequentially lettered, so I
changed L to the next available letter, took H-K and moved them down 1
letter and changed the temp letter to H (all in Disk Management). Still
everything showed up okay in Computer, Disk Management and Device Manager.
Now for the problem.
Next reboot the computer said it had to install new drivers. I let each of
the two iterations find the appropriate driver, after which it had to
reboot. After the reboot the drive failed to show up in Computer or Disk
Management, it showed up as other devices in Device Manager. The next
reboot asked for drivers again, but this time both iterations failed to find
drivers. The solution offered was to download KB940199 which I did and it
would not install. I checked to see installed updates and see I installed
it on 1/1/2008. Next reboot asked for the drivers again and this time I
clicked not to offer the New Hardware Wizard again for this device for both
iterations (still just one drive). Next reboot failed on hardware failure
0x0000007b. I booted with last known good, successfully, but now asks for
drivers again.
Short story, now I either have to select ask again and go thru this each
time the machine boots since every time I select Don't Ask the hardware
crash occurs.
It makes no difference whether the drive is connected or not. With it
connected I get the drive shown in Other Devices with the driver not
installed. If I change to another SATA HD, It still lists the original hard
drive number, not the new one.