Hola de nuevo Hardrive, aqui te dejo el reporte del ewido

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ewido anti-spyware online scanner
http://www.ewido.net
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Name: TrackingCookie.Adbrite
Path: :mozilla.31:C:\Documents and Settings\Administrador\Datos de programa\Mozilla\Firefox\Profiles\2skv7ypy.default \cookies.txt
Risk: Medium

Name: TrackingCookie.Adbrite
Path: :mozilla.32:C:\Documents and Settings\Administrador\Datos de programa\Mozilla\Firefox\Profiles\2skv7ypy.default \cookies.txt
Risk: Medium

Name: TrackingCookie.Adbrite
Path: :mozilla.33:C:\Documents and Settings\Administrador\Datos de programa\Mozilla\Firefox\Profiles\2skv7ypy.default \cookies.txt
Risk: Medium

Name: TrackingCookie.Adbrite
Path: :mozilla.34:C:\Documents and Settings\Administrador\Datos de programa\Mozilla\Firefox\Profiles\2skv7ypy.default \cookies.txt
Risk: Medium

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muchas gracias por la ayuda