I had the exact same problem on Windows 8.1 pro 64 bit with openvpn 2.3.2.Using the "Install new TAP..." option in the start menu rendered this exact same error message, even when run with administrator privileges. Added some generic tap-windows installation debugging documentation here. If you are experiencing tap-windows installation problem, make sure you've tried the steps outlined here.
All the files are in a folder called "USB-Emul_Win64".
I downloaded a fresh tap-windows-9.9.2_3from the website and installed using that. If the tap-windows issues still persist, please file a new bug report.
First thing I have noticed, that it didn't create a cat file.
Updating drivers for tap0901 from C:\Program Files\TAP-Windows\driver\Oem Win2 --- after investigation I discovered that this driver is to be installed with the Class-GUID= the same as the VMNET1 driver of the Vm Ware?
Other question is it can be changed only in file without touching and files.