The installation stops due to following error, PreInstallCleanup | Severe | FindAndRemoveDriver(): OpenSCManager failed: Access is denied.
In Windows 7, the built-in Administrator account is disabled by default. If you want to install the Endpoint Agent on Windows 7 you need to enable the "Built-in Administrator Account" and assign a password to it.
Please follow the steps in this Microsoft article:
Enable and Disable the Built-in Administrator Account
To install the agent on Vista or Windows 7, the install must be performed from an Elevated Command Prompt.
1. Click on Windows 7 Start Button
2. Go to All Programs-> Accessories
3. Now right on Command Prompt and select “Run as Administrator” from context menu.Then run AgentInstall.msi from this command prompt.