Scroll wheel doesn't zoom?

this depends on the type of event the mouse wheel is issuing if used in connection what the application is expecting.

using the native Windows driver should normally work w/o any probs, using a proprietary driver of the make of the mouse may lead to this issue.

you can either try to unistall the proprietary driver of the mouse maker or configure the driver concerning the event issued (i.e. ‘universal scroll’).