You don’t mention what version of win7 64 you are using, like Vince mentioned, Ppro2 was out along time before vista/win7, you can try rolling back your audio drivers to the ones you used previously, also if you have win7pro/ultimate you can try setting the xp compatibility mode via the “program compatibility troubleshooter”, if you have 7 homeprem you can try to set the compatibility mode going to the Ppro directory and right clicking on the Ppro exe file then select “troubleshoot compatibility”, or you can select properties, then the Compatibility tab and then the compatibility mode check box will allow access the the various modes available in the menu dropdown.