Hey Daniel,
Try installing the following patch, it might be relevant for both your Windows 7 and 8 operating systems:
When using HP Send Fax software from a computer that recently installed Internet Explorer version 11 (IE 11) to send a fax to a LaserJet Pro MFP via a network connection, an error message displays Unable to communicate with the device.Run this utility as a short term solution to fix this issue.
If those doesn't work you may try the workaround above, the software ment to work in a native Windows envoirnment, not in a virtualized envoirnment such as Parallel.
Shlomi