my previous computer would occasionally restart itself spontaneously, with no warning. this became more and more frequent, until one day it shut itself off and wouldn't start again at all, and i had to replace it. i thought the power supply had failed. however the new computer is also showing this behaviour. it is currently only about 6 months old, and i made sure to buy a box with a sturdy power supply, precisely for that reason.

it just did it this morning in fact. when it comes back, it gives me the message "windows has recovered from a serious error."
so now i'm wondering, it seems unlikely that *two* power supplies in a row should fail, with exactly the same symptoms. could this be a problem with the electric outlet in the wall ? (it's an old building and the electrical installation leaves to be desired, to say the least... maybe there is not enough current in there ?) could it be a software problem ? i started with a fresh re-installation of windows, not from a disk image, but maybe there's a conflict between some drivers, or something ? (i have no idea, i'm really just guessing)
any ideas ??? this is really getting to be a problem, and i don't want to have to replace the damned thing less than a year after i bought it.

any help is really welcome.