This is the first time I have encountered with this error. Since I had lots of work to do I logged on to one of the servers and did my work thinking that the error will disappear when I access the actual machine in the morning. But to my surprise the error persisted when I switched on the monitor in the morning. So I tried the usual Ctrl+Alt+Delete. And there lies the familiar screen which made me relax as shown below.
So I chose the Start Task MAnager option and luckily got into the computer. But I am not sure why the error has come up. Have any of you had this error before? If so what did you do? And do you know why this error came up?