Need help with computer freezing up.

My Computer freezes up and it will either restart, blue screen(with a different error all three times), or just freeze with whatever is on the screen. Can't use mouse or keyboard. In the Event Viewer I always get these three errors at the time it freezes.
1. Service Control Manager, Event 7000, The Parallel port driver service failed to start due to the following error:
The service cannot be started, either because it is disabled or because it has no enabled devices associated with it.
2. Service Control Manager, Event 7024, The Forceware Web Interface service terminated with service-specific error 1 (0x1).
3. Service Control Manager, Event 7026, The following boot-start or system-start driver(s) failed to load: ntiomin
I don't know what these mean. It usually happens 20 min to 2 hrs after startup.

Might be the RAM at fault here.

Download this http://www.memtest86.com/download.html

Burn the ISO to a CD and run the application (you'll have to set Disk Drive to boot priority 1 in the bios for it to run before windows does).

Run the test for a few hours and if the RAM is at fault it will show up as errors being made.