Windows Store

I cannot access Windows Store on my laptop.  I have Windows 8.1 installed but since I installed Norton on my laptop (or it seemed to be around this time, might be a coincidence), I have been unable to access the store.  It comes up with a message saying Something happened and the Window Store is no longer workingPlease restart your PC and try again. If this problem continues,you might need to refresh Windows on your PC.

I have had this for a while as I have not wanted to refresh as I am concerned that I will lose everything on the laptop. 

Can somebody please help - what will happen to my laptop if I do this refresh?  Is there another solution?  Has anybody else had this problem?

Thanks for any help.

S