Ensure that you do not have a software that starts Firefox in the background with Windows. This software is to allow Firefox to start faster, but may cause this. If you have not "preloading" software installed and active, please ensure that your computer is not infected with malware or other harmful files. Here are some great free tools for scanning Windows: * [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner] * [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware] * [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility] * [http://www.surfright.nl/en/hitmanpro/ Hitman Pro] * [http://www.eset.com/us/online-scanner/ ESET Online Scanner] * [http://windows.microsoft.com/MSE Microsoft Security Essentials] ----

I ran all the scans you suggested and got nothing for spyware or malware or virus. What else do you suggest?

Maybe a program installed on your computer has setup a scheduled task to load Firefox on computer start-up.<br> Please ensure that there are no scheduled tasks that would force Firefox to load.<br> This may include links.