HP tattoo's their BIOS so that you can only use a like model to create the recovery disks.
Please attach as many of the dump files as you can recover (up to the most recent 20 or so)
You can read the BSOD by accessing the Safe Mode menu and selecting "Disable automatic restart on system failure"
Yes, it's possible that copying the one registry hive (without the others) has caused this problem.
Have you tried copying all of the hives from the REGBACK location? (don't delete the others, just rename them so you can go back to them if you need to).
In case this is an infection, try these free, bootable antivirus disks: Free Online AntiMalware Resources