crwdns2933897:0crwdne2933897:0

Account user name changed

When I logged on to my laptop today, my user name had changed from my name to my email address, without anyone changing it. What happened? Should I be worried? How do I change it back?

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

crwdns2934109:0crwdne2934109:0

crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0