Control the Auto Complete Mode

Start/Run/Regedit

“HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\ Explorer\AutoComplete”
Value Name: Append Completion Data Type: REG_SZ (String Value) Value Data: yes or no Create a new string value, or modify the existing value, named "Append Completion" and set it to "yes" to append the suggested text as you are typing or "no" to only show a drop-down list.

Restart Windows for the change to take effect.