Unable to open more then one browser window with IE6 sp4

Hi,

My OS is Win 2000 Pro. When I booted up this morning I cannot open more than 1 web browser on my toolbar, the new browser will simply overwrite the existing one. I have run spyware, ADaware and AVG virus and detected nothing. However, my kids were using my PC last night. Is there some way of repairing the IE6?

Thank you for the help.
 
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