First make sure all your files are correct and complete. Go to your VAM directory and run
VaM_Updater.exe
, and click on "Options":
Then run "Sync/Repair All":
This will check all your local files, and will download missing/damaged files in case there are any. This can take a few minutes, wait until it's complete.
When it's complete, close the
VaM_Updater.exe
, and run
VaM (Desktop Mode).bat
if you want to run VaM in Desktop mode. For VR mode you need to start SteamVR first, and then run
VaM (OpenVR).bat
(I'm only familiar how to do this with SteamVR and a HTC Vive or Valve Index, I don't know anything about any other VR headsets like the Oculus).
If this still doesn't work, post your computer specs (what CPU, GPU and how much memory you have).