2 slots. I don't have the original any more.

When I got the machine in 2001 it had 256 mb. In early 2002 I ugraded to 768. The problem started about 3 months ago (I had not yet made any changes). I updated to 1 mb about 2 weeks ago. It has...

Both the system (sometimes) and the programs (sometimes).

I am having random restarts in addition to random program crashes (usually IE, Firefox, Mozilla Thunderbird and Dreamweaver MX). The programs tend to crash without warning – they just disappear!
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