Arc Service Defaults in Windows 7
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Arc is a kernel device driver. In Windows 7 it won't be started if the user doesn't start it. If Arc fails to start, Windows 7 attempts to write the failure details into Event Log. Then Windows 7 startup should proceed and the user should be notified that the arc service is not running because of the error.
Restore Default Startup Configuration for Arc
1. Select your Windows 7 edition and service pack, and then click Download.
2. Save the Win7_arc_Service_Startup.cmd file to a local storage device.
3. Run the saved file as an administrator.
4. Restart the computer.
The arc service is using the arc.sys file that is located in the %WinDir%\system32\DRIVERS folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 7 installation media.