iPad AppStore not downloading apps

For some reason i was downloading free apps on my ipad just fine a few minutes ago and now the App Store wont download any new apps! It downloads recent apps just fine but when i tap the free button on the app i want and put in my password it says waiting for a few seconds and then it says free again and doesn't download the app. the iOS is updated to the most recent version, I'm only using half of the system memory, my wifi is fine, I've tried logging in and out of my account, switched off iCloud, rebooted the iPad, and still it won't download new apps. My ipad isn't jail broken or hacked and I'm not going to set it back to factory setting because 1. its protected by my dad's password and 2. I have stuff that I want to keep that I'll loose if I reset it to factory setting. Plz help? I've tried downloading any free app on the App Store and it does the same thing.