1: make sure you have the ventrilo status binary
The binary is packaged with the server from the vent website and comes in 2 flavors:
Windows: ventrilo_status.exe
Linux: ventrilo_status
2: see if the binary is in the right place
3: see the binary's permissions - they depend on what user your http daemon is running as
4: see the file path in the configuration options of the script
5: see <?php phpinfo();?>
6: search forums
7: seek further help or continue solo
PLEASE post any alternate troubleshooting paths or steps you may discover while tinkering.