Windows 8 - Metro UI crashes / Office works very well

After turning on my Acer Aspire S3 yesterday, I found the Windows 8 start in mosaic screen start crashed immediately.

Reset, I found that I got about 2 seconds of reaction that it crashed again. Nothing works except the 'Windows' - key, which obviously resets the screen in mosaic... for another 2 seconds before it crashes again.
If I'm quick, I can click on the mosaic of office, which takes me to my desktop interface. It seems to work fine and I can access the files - although, oddly, when I alt - tab there are often two or more icons open... it says "broken desktop", another "scanned image"... even if nothing else is open.
Return to the menu start mosaic, if I sign up quickly in the profile of my wife (before it crashes!), I find that both its menu in mosaic and the desktop interface work perfectly.
What I did for my log-in?
I read on the forums that some users have referred to a "clock App" had been originally some menus in mosaic to crash... but I'm not enough fast to uninstall my application before the tiled menu crashes. Is it possible to uninstall apps from the desktop interface (they do not appear in Control Panel)?
If not, have I accidentally changed something? I use my laptop for very simple things - browsing the web and e-mail. I use it for the thing most complex is remote access to my work desk. Would it could cause a problem (he has worked up until now - I bought the machine in January of this year).
Can anyone help?

Problem solved... for now at least.  I did the system restore earlier I could do (23/05/2013) and it works again. Ominously, this restoration comes just before a Windows Update, which would suggest that is what has caused the problem in the first place!

A little wary to do the update now... so will hold off for as long as possible!
Thanks for your help!
 

Tags: Windows

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