To fix the ERROR installing tap on windows 8/8.1, you need to do the following things:
Start your window in SAFE MODE now how do u do that?
Follow these steps:
Swipe in from the right edge of the screen, tap Settings, and then tap Change PC settings.
(If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, click Settings, and then click Change PC settings.)
Under PC settings, tap or click Update and recovery, and then tap or click Recovery.
Under Advanced startup, tap or click Restart now.
Once your PC restarts, on the Choose an option screen, tap or click Troubleshoot.
If you don't see the Startup Settings option, tap or click Advanced options.
Tap or click Startup Settings.
Tap or click Restart.
On the Startup Settings screen, choose the startup setting you want.
Sign in to your PC with a user account that has administrator rights.
download openvpn via this link:
https://openvpn.net/index.php/open-source/downloads.html
Make sure you download the appropriate one for your system either x64 64bits or x86 32bits
After downloading, install using administrator permission(right-click and run as administrator)
The openvpn will install and automatically the TAP will install too. After installation, restart your computer and its SOLVED!!!
