If you are visiting the Windows Store from Internet Explorer (rather than, say, Google Chrome, Opera, or Firefox), try resetting the desktop IE to defaults. Open desktop Internet Explorer, click on the gear icon for "Internet Options", go to the Advanced Tab, select Reset, and select Reset again.
That seems to have worked for several other folks getting that error.
Newer versions of 15 of the common apps that come with the default Windows 8 came out quite recently (I saw the notice & updated them this evening). The newer versions might fix a few problems with the originals.
Best of luck,
. . . Gary