How do I stop Adobe Acrobat from phoning home upon startup?

When I open any PDF document, my Windows firewall says
- ACROBAT.EXE, Process ID: 1111
- (Adobe Acrobat 7.0, Adobe Systems Incorporated, Ver. 7.0.0.1333)
- Attempting network activity.
- Do you want to trust acrobat.exe?
To which I always say no.

I've checked all the settings and can't figure out how to stop Adobe
Acrobat 7.0 Standard from phoning home, particularly:
- edit > preferences > updates
- do not automatically check for critical updates

How do I stop Adobe Acrobat 7 from constantly phoning home?