这个问题在EveryThing官网(官网FAQ)上有解决方案，如下:
How do I prevent the UAC prompt when running "Everything"?
"Everything" requires administrative privileges for low level read access to NTFS volumes for NTFS indexing.
The UAC prompt can be avoided by running "Everything" as a standard user and installing the "Everything" service or not using NTFS indexing.
To run "Everything" as a standard user and install the "Everything" service:
- In "Everything", from the Tools menu, click Options.
- Click the General tab.
- Check Everything Service.
- Uncheck Run as administrator.
- Click OK.
- Exit "Everything" (right click the Everything system tray icon and click Exit)
- Restart Everything.