Computer reboots at random!

Hey everyone!

My computer's been rebooting at random - the screen goes black and it starts booting up again. A few of the error codes I've seen in the event viewer are: 100000e (a reboot two days ago) and 100000d1 for the latest random reboot.

I'm thinking it's a memory issue because the system is so old, cause a full scan of the hard drive revealed no errors.

Should I try buying new RAM and seeing if that solves the issue?

http://www.memtest.org/

Use this first and let it run for awhile. It is very good at spotting memory errors.