touch screen feature stopped working. Display works fine

My ACER Iconia 100 has a problem. The touch screen feature has stopped working. Worked one day not the next. It was not dropped, bumped or anything. JUst stopped working. The screen display works fine. How do I fix this?

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

crwdns2934109:0crwdne2934109:0

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