hehe 1.77 mhz eh? I think you mean 1.77Ghz
Hmm...i'm thinking the RAM could be the issue with this. How many RAM chips have you got on the board?
I guess you have a 256mb chip, and a 128mb chip. In that case, take out one of the chips, then test it by opening and closing programs that would normally crash. If that works, put that one back, and take the other out and try the other.
Your bound to find one that makes it crash, and then the worst case scenario is that you'll have to replace one of the RAM chips with a new one
make sure its the same speed as the one you already have though.
If its the 128mb one, I would get another 256Mb of ram to make your computer 512mb. This would make it a bit faster than you have, plus just seems logical to me