Hi everyone,
I've been solving virus infection problems since a long time, and W32.Downadup has a complete chapter. I've added a new article called (How to beat W32.Dowandup infections - Outbreak Scenario)
https://www-secure.symantec.com/connect/articles/how-beat-w32downadup-infections-outbreak-scenario
If you have any comments/issues you are welcome to speak