Power Supply Unit is worth checking (if you've another spare swap it over), Bubba mentioned RAM too (take them out one at a time).Software updates shouldn't cause resets, unless they're unofficial/cracked software which might be infected.
Are you getting any error beeps on start up?
Thought you tweeted that it was out of warranty based on manufacturing date?
Have you checked the Event Logs for error messages?
How much stuff do you need to back up?
Sounds like an investment in safe storage may well be a good idea.
I bought the same machine a few weeks after you. Hoping mine doesn't go tits up too.
Still sounding like dodgy RAM?
Paul, also get your ass on the sale of goods act - the retailer has to honour your contract of sale, the statutory one is the 1 year that all manufacturers so generously give us - but FAK the limit is ages on a product remaining 'fit for purpose' - i.e. if you can reasonably expect a computer to work, and keep computing, or longer than 11 months in your case then they got to sort it out - but you have to get ebuyer to sort it. The other issue is about goods of 'merchantable quality' - i.e if something is so shit they shouldn't be selling it in the first place based on what they say it is and the price point etc (this is digression as your PC did obviously work for a bit)I think the difference is thus: up to a year, they have to prove you wrong - i.e. test the PC, then say you're full of shit. After 1 year, you have to prove it's faulty. Summat like that. They should be taking the PC back and sorting it if it's faulty.Also this 1 year warranty based on date of manufacture?If they sold you a PC with a 1 year warranty, and it's sealed etc., the warranty is a year from the purchase date.... don't let these cunts rob you!IF you end up where they offer you a refund / replacement and you have to return, I'd suggest keeping the hard drive anyway as they only shred them (legal issues with data) so you may as well, and at least have a chance of recovery of pics if you don't get to do it before.