You can uninstall Electrical, without uninstalling everything else.
To do this, go to Control Panel>Uninstall a Program>Right click on SOLIDWORKS>Select Change
This will launch the SOLIDWORKS Installation Manager. Select Modify this individual installation. Hit Next until you get to the Product Selection stage. Uncheck Electrical and any other products you wish to uninstall. Follow the prompts from there.
This will uninstall Electrical and anything else you've unchecked.