Application installer stopped working.

I am in the UK Samsung galaxy tab stopped working properly so reset the whole device as a message keeps popping up saying "unfortunately application installer has stopped" before resetting we were able to use a few apps now nothing just the message popping up! Anybody know what to do?

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0