Start-Up Programs - Editing in Vista using Windows Defender

Somebody please confirm my understanding, or tell me what I am missing!

 

1.  NIS 2009 requires me to turn off Windows Defender on my Vista Ultimate PC

2.  To edit the start-up programs, however, I need to use Windows Defender.

3.  If Defender remains on and conducts a scan, NIS 2009 will shut it down.

 

Is this right?

 

Thanks,

 

FixMyBox