I'm not sure if you have this option below for Win 8 ???
Make cataclysm.exe shortcut on your desktop. Right click it and go to compatibility. Make the following changes.
| | Run this program in compatibility mode for:
Windows NT 4.0 (Service Pack 5)
| | Run As an administrator.
In the address boxes of your shortcut, use these switches. Keep your own path, just add (or copy and paste) the switches to the end of the top address bar in your shortcut. Example below. Pay attention to the spaces:
C:\Users\herby\Games\HWC_Installed\cataclysm.exe /disableAVI /triple /nofastfe
Hope it works for you.