Windows XP- System Alert

Un saludo vassago2....
Tengo winXP recien instalado y conecte a internet... Al poco tiempo salio una ventana que dice:
Messenger Service
Mensaje de SYSTEM a ALERT el 09/10/2005 23:31:41
Warning!
We detected a dangerous Virus installed on your computer but was unab le to remove it. This virus allow companies/users to monitor your Internet browsing patterns. It's recommended taht you install the latest software to remove these by going to:
www.fixms.com
.... Y asi algunos mensajes similares:
Critical System Error! The windows registry appears to be infected. Please go to th universal registry infection cleaner at www.uric.net to scan and repair the system....
tengo el Mcafee suite 7, creo que actualizado....
Que debo hacer????
Gracias...