Gallery and permissions, and support links

I down loaded a few apps to change my keyboard, live wallpaper, and à background theme, now I can't get my gallery back to the normal screen, (standard). Most if my apps like backup and restore aren't working, ànd no default, support links, or memory in these apps are showing any type of activity. On these apps, when I go to each app, memory, support links, and app links are faded like they are disabled and I can even click on dem...please help