Memory Questions

I tried loading both Mandriva 2007 and Ubuntu 7.04 on my wife's system.
Both failed because of a memory error. So I have three questions about
memory:

1) what is the difference between ECC memory and non-ECC memory?
2) is non-ECC and ECC memory interchangeable?
3) is crucial.com still the best place to order memory from?

TIA

Jim

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