Windows Explorer Hangs: Internet Explorer Not Responding Issue

Hi All,
Off late I have been facing a problem with IE (Internet Explorer). After using the IE for a while and lock my laptop and return in a while the explorer hangs up. The window does not close on trying to cross off. When I try to close it with the 'Task Manager' a pop-up comes up saying IE not responding trying to resolve but the task does not end. I cannot even forse shut down/restart the laptop. I need to switch off the power and then restart. Please help!
