From last few days I get error message for any activity in wordpress free blog or any wordpress in domain. I don't know its with my pc or its with general. The following image is one of the error message.

wordpress Error.jpg

This message is from comment section. Even when I add widget, it show with some other URL. Dashboard has also has a custom.
Any solution for the above problem? (I have already cleaned my browsing history, cookies, some plgins and scanned the PC).