Hope you don't mind if I put in my two cents?
Were you running multiple applications at the same time, including Fish Tycoon? Once, I had six applications on at the same time, and my computer froze. (What? Six? Oh, try doing your chemistry labwork at home using MSW, Excel, and IE, and running Fish Tycoon and talking to friends on two different Instant Messenger programs!) Anyhow, since I normally run only four or five applications at the same time while I play FT, it has never happened again.
My computer is also a HP Pavilion (I think. The label came off a long time ago...) and it runs Windows XP. Just fyi.
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Rainbowfish
~LDW Games addict.