To disable the auto-complete option of Windows Explorer (Search box):
- Click on Start > Run > Type " regedit"
- Expand the following key:
- HKEY_CURRENT_USER> Software> Microsoft> Windows> CurrentVersion> Explorer> AutoComplete.
- In the right pane select the "AutoSuggest" entry and set its value to "No"
- Validate with the OK button.
- Close the registry and restart your PC