Freezing, slowing down or instability could indicate a possible fault with the hard drive. The computer stopping at 60% on an upgrade could also mean a possible hard drive problem, bad sectors preventing the information being written to the drive.
You could try rebooting and see if it will continue with the upgrade.
If you still have problems I would do a clean install. Formating the drive may rectify any possible drive problems.
If you go to the Manufacturers web site you should be able to find all drivers needed.