I found this online. I wasn't able to get it working as it kept saying that one of the programs was being run but it might work for you.
You're Software Distribution directory has corrupt or locked files. To correct this issue, there are two steps.
First, browse to C:\Windows Locate SoftwareDistribution and rename it to SoftwareDistribution.old
Windows will prompt you with "You'll need to provide administrator permission to rename this folder". Click Continue.
Once that has been renamed, you will now need to reset the store's cache. This is done my pressing the windows key (on the keyboard it's between the
Ctrl and Alt keys) and then the R key, This will bring up the RUN command window. Type wsreset.exe in the box and press enter. You will get a full screen message from the store stating "The cache for the Store was cleared. You can now browse the Store for
apps.