Win 8.1

Why do the apps on my desktop end up with an X (unusable) on most of them which requires me to go to the store and repair each faulty app individually. Once repaired, the system works like a charm until the next reboot when I have to repeat this process. Has anyone encountered this problem, and is there a fix please?

Had the same problem.

Its just when i tried to fix it didn't work and after i re-install those apps some of them was damaged.

Did you used any cleaning software before that "X" happen?
Also did you switched to Local Account before that "X" happen?

Try this thread and go through each troubleshoot till windows recognizes the problem accorded whiten your apps.
http://www.eightforums.com/tutorial...apps-troubleshooter-fix-apps-windows-8-a.html

Also you can try this thread.
http://www.eightforums.com/tutorials/21051-apps-tiles-not-working-responding-fix-windows-8-a.html

Many thanks Maxeyas. I will follow your tips and hope these will help overcome my problem. I have recently installed a Win 8 compatible version of AVAST Free and wonder whether this might have something to do with the app errors. I will keep you posted.