Hi Célia,
I'm sorry, I should have forewarned you that combofix would automatically reset your homepage and browser to Windows default. It does this as a precaution since so many infections hijack that area.
I'm not seeing any malware in that log--and you haven't found any either with all the scans you've completed so this appears to be an issue with your mouse. If the mouse starts acting up again, my suggestion would be to begin a thread in the
Other Hardware Support section.
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"It is one life whether we spend it laughing or weeping." "Take the time to laugh--it is the music of the soul."