Internet Explorer won't close!?

As of a day or two ago, when I try to close out Internet Explorer (I think I have version 7) the window goes blank and nothing happens. I have to go down to the start bar and click close a couple times before I get 'This program is not responding.' I have Norton so I did a scan, that didn't help.... show more As of a day or two ago, when I try to close out Internet Explorer (I think I have version 7) the window goes blank and nothing happens. I have to go down to the start bar and click close a couple times before I get 'This program is not responding.' I have Norton so I did a scan, that didn't help. What's going on?
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