Rotate View not working with mouse scroll press. Help!

I've got a Microsoft Optical Mouse 3000. I can't rotate apart by pressing the scroll wheel down. Any suggestions would begreatly appreciated.

Thanks!

EDIT: I've uninstalled the drivers that came with the mouse, andI'm now using the standard mouse driver with Windows. I'm able torotate the part with the wheel button press again.SolidworksUser Interface