First try the following: In Windows Media Player, Click Tools-->Options---> Security Tab.
Make sure that "Run script command when present is not checked. Also place a checkmark on "do not run script commands and rich media streams..."
Next click on Zone settings, and set each of the web content zone to their default settings.
Next click on Security tab in windows media player options and uncheck "aquire license automatically..."
If the problem is not resolved by following this sollution, you pc may be infected with spyware. In this case I will sugest you download a software called hitman pro. you can find it here http://www.hitmanpro.nl/hitmanpro/
There is another tool you may wanna use it may be critical in this case. It's called Hijackthis. Its very effective for popups. Download it here: http://www.download.com/HijackThis/3000-...
Allow it to scan, see if it finds the website that pops up each time.
Hope this helps.
Let it scan & remove spyware. if
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