Could be memory, but I kind of doubt it... I do know my laptops have been rather iffy when it comes to suspending/sleeping. My HP would almost always lock up before entering sleep, or bluescreen during sleep and reboot. I know my grandparents Compaq has also done both, and my Fujitsu has locked up once before sleeping... So, Vista does seem to have problems with this.
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Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
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