I'm a pretty chilled and polite person, but if it would make any sense or there were any chance to win this I would immediately sue this dumb 1ss b1tches from ableton...
No offense, but this is a little dramatic. Live's software update does not have the capability to completely destroy your machine as you describe.
When you press the power button, what happens? If absolutely nothing at all, then you likely need to acquire a new power supply.
If fans turn on and it starts humming, but you don't see a display, you need to investigate that area...
Perhaps you had a RAM flaw that was exposed while Live was doing it's stuff.
If it turns on, but windows fails to start, you should look into restoring from Windows restore.
Saying that it's completely dead says to me that you aren't familiar enough with computer hardware to make such a diagnosis.
I'm not arguing that perhaps you are indeed having pretty severe computer issues, but I think your computer is probably in better shape than "completely dead" -- you should ask a nerd friend to check it out.