I will tell you my little story with "device not found"

At home i have updated many times my n800, but recently i couldn't.
i was desperate thinking that i could have hurt my n800. i reboot it 1000 times
and red all the google about this problem, i tryied mostly everything but i was still getting the message "device not found".

What was the problem??? The update wizard is not working under "windows vista"
( i had recently installed vista instead of xp)
that was the solution to me (it had nothing to do with the way i was pressing the buttons, the problem was windows vista)