need little help with computer

ok so when i was trying to play some webclients i kept getting this error but i thought nothing of it but i went to get some pics of my acc im gonna sell and i get it when loading login.so could someone help me fix this. just tell me what problem and how to fix(please give links and stuff tho and detail)
heres a pic
http://i42.tinypic.com/1zywvgh.jpg