I saw some posts a while back on the refusal of Windows Store not running. I have a quick answer:

Press 'Windows and R', type 'wsreset.exe' in the run box and press 'enter' - fixed.

Apps updates:

Launch win stores app; click the head and shoulders icon next to search box, then click settings. Slide the Apps Updates to On.

If its 'greyed out' - win 10 will be shortly fixing it.