Whats going on with this: Laptop works find for say 45 mins when first starts, fan whirrs away etc, then the fan stops and I get major slow down. On task manager CPU usage reads 100% despite the fact only the internet is up and running. I have a celeron 1.2, win xp and about 350mb ram. Any ideas or advice? I set the power management to never turn off when plugged into the mains.