I have an officejet 7780 and 3cx phone (v9 with video) installed on mine and all is good.
Given you had windows 7 problems too (I have win 7 64bit with this install) I would suspect the problem lies with the HP install rather than 3cx.
You may want to update windows, uninstall the officejet, reboot, reinstall the officejet and see if the problem clears.