Error message seen while closing Internet Explorer after surfing the net

Hi,
My computer is running on Windows 7 operating system. Everything is running perfectly fine. After surfing the net, when I close the internet explorer, I get an error message on my screen:
'The instruction at "0x62304320" referenced memory at "0x62304320", The memory could not be "read". Click on OK to terminate that program.'
Anybody has any idea as to what is causing this problem?
I've searched a lot, but still my problem persists.
Looking forward to your replies.
Regards.
