Sounds like bad ram. Run a checking utility and see if it will find bad ram. Do you have the original system checker disc that came with it?
Isn't there a utility called "Gauge Pro" or something

I forgot what it's called...

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Yes, that´s what I thought, I´ll give it another try tomorrow. Yes Gauge Pro has a "memory test". I´m not sure if the memory test within Gauge Pro will lead to something, as It also ould be only for performance test. Should´nt the test of the OS do a integrity at startup?