SpyWare or Virus Attack .Please Help

Dear friends
i’m currently using win2003 with latest updates from microsoft website. yesterday i noticed something very disurbing

whenver itried something in run command, or try searching using google or try and enter any text either in word ,notepad it starts typring “x” automatically. on the text fields. i scanned for viruses using NAV 2005, chckd for syware using spybot and spysweeper. no threats found et all. this problem even exsists in dos prompt.
does anybody have answer to this.
thanx and regards
ashwinbole