Hey ap0x, Welcome to F|A Forums!
- Make a Wolf:ET shortcut on your desktop if you don't have one already.
- Right click on it and select properties
- Go to the compatibility tab
- Check mark the box for " Run this program as administrator"
- Select Ok
Try running the game now, if you did it right you should get a permission dialog asking if you want to run this program, choose yes.
Hopefully this solves your problem, if not then reply. Good luck!