I am not too familiar with laptops. Ok, I am not at all familiar with laptops.
Usually, freezing up is the result of either too much heat or bad memory. It could also be from loose connections.
How much memory does it have? If it has more than 64mb, then that might be a problem right there, because the Intel 430 series chipset will only cache 64mb. However, that shouldn't freeze it up, just slow it down.
If you're not comfortable with opening up the laptop, I suggest taking it to an experienced technician. Laptops can be a bear to work on, or so I'm told. I guess it depends on how much time and money you want to put into it.
Sorry I wasn't of much help. Hang tight and some laptop savvy people should respond yet today.
Big Blue 66
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