My son is attempting to be an avid Ubuntu user it seems, quite adventurous for someone not even two. I'm not sure what he did, but he managed to open Ubuntu's software center about twenty times. Next thing I know I am getting a whole of bunch of error logs and "not responding" messages. Next thing I know my applications are missing from the dash home. After a ton of digging I finally found this awesome answer at askubuntu.com.
Open up terminal and paste:
rm ~/.cache/software-center -R
unity --reset &
And you should be all good. If not try logging in and out or rebooting. I had tried using unity --reset alone and nothing happened nor removing, installing, or reinstalling the software center. I hope this saves someone a headache.