He tried the standard fix: regsvr32.exe . No luck. He tried running as Administrator. No luck. He checked the logs. C:\Windows\System32\drivers\sentinel.sys . Access Denied.
Or in a command-line sc start sentinel : Sentinel Emulator 2007 Error 1275
For older applications, running the main executable in compatibility mode can sometimes bypass initial driver checks. Error 1275: This driver has been blocked from loading. He tried the standard fix: regsvr32