i also have this problem i am downloading this large file and when i leave mi laptop on for about 1/2 and hour with the lid closed it blue screens and it cant dump the physical memory and then reboots
plz help me!?!?

its a fijitsu siemens amilo whith dual core processor 2 gb ram and vista home premium

Is that your only problem?

" downloading this large file and when i leave mi laptop on for about 1/2 and hour with the lid closed "

If so don't close the lid.

If you have this issue at other times and doing other things then check out your Event Viewer:

Working with Vista's new Event Viewer