Firefox opens spontaneously with an advertisement window. What can I do to block it?

At any moment, Firefox (3.6.13) starts, showing an unknown advertisement window.I have uninstalled Firefox and install it again, but the problem remains.

This type of behaviour can be caused by malware. Try running several malware scanners. It is best to run several as each will pick up things that the others miss. Some scanners you can try are:
* [http://www.malwarebytes.org/mbam.php Malwarebytes]
* [http://www.superantispyware.com/ SUPERAntiSpyware]
* [http://www.lavasoft.com/products/ad_aware_free.php Ad-Aware]
* [http://www.microsoft.com/windows/products/winfamily/defender/default.mspx Windows Defender]
* [http://www.safer-networking.org/en/home/index.html Spybot S&D]

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