This is probably due to a hung program running in the background. use CTRL+ALT+DEL to get the task manager, if there is anything listed with [Not Responding] end task it. If that doesn't sort it shut down everything that you don't need.
If this doesn't work, try restarting the computer
Error 600, 600 DUN Errors600, Error, DUN Error 600Error 600 DUN Errors |