Macbook freezing and shutting down after Leopard install

so.. i have a black Core 2 Duo Macbook with 2gb ram, and i installed Leopard on it.
several times since the install, the screen has frozen - all animations stopped, everything unresponsive, etc. the first few times that was it - then it's been crashing within an hour or two every time i reboot - this time with the message telling me how to restart my computer by holding down the power button.
not sure what is causing it - i thought it was Spaces, but i disabled that and the crashes are still happening.
anyone else experiencing this???

I have had a number of hangs on my new 24" iMac with Leopard, but none so far on my MacBook. I thought I had found an explanation last night after reading an artice on the Daring Fireball about Logitech mouse drivers ( I use an MX1000 Laser Mouse ) so disabled the Logitech Control Panel, but I have just had another hang. This time I was just logging into work in Win XP under Parallels but last night I was just browsing in Time Machine.
Hope I can find an answer soon as this is getting a little frustrating.
Scott
http://ukmac.net

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