Acad2002 - Zooming DWG with a4tech Mouse

Hi! Did anybody have problems with zooming DWG in Acad'2002 with A4Tech D-Wheel MOuse. I can scroll DWG with 1 wheel but can't zoom with the 2.
Please help! CZ
PS. Maybe I need other a4tech driver ? I have mouse www-31 model (2 wheels + 4 buttons)
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