The problem started with my last Windows Update, version 2004, build 19041.450. When I ran Sandboxie, Windows complained about a compatibility problem. I then tried to install the latest version. According to Sandboxie Control, the errors are as follows: SBIE2331 Service start failed: [22 / 5] Access is denied. I am unable to start up Sandboxie. I get the following errors: SBIE2331 Service start failed [22 / 5] Access is denied. The Sandboxie driver [SbieDrv] is not available to sandbox programs. Make sure both the driver and Sandboxie service (SbieSvc) have started successfully. When I checked the service SbieSvc, I could not start the service, even if I tried to start it again.