hi,
try resetting the Store cache:
Press Windows Key + R to open Run.
Type wsreset.exe and click OK.
A blank Command Prompt window will open, but rest assured that it's clearing the cache.
After about ten seconds the window will close and the Store should open automatically.
If the above doesn't work try running these scans:
File scans
Look for command prompt in the start menu, right click on it and choose 'run as administrator'. Type:
sfc /scannow
press enter and await results
In the same command prompt and after the above scan has finished type:
dism /online /cleanup-image /restorehealth
Press enter and await results (longer this time).
If the first scan found files it could not repair but the second scan is successful, run the first scan again using the same command prompt box and this time it should repair the files found.