You may find that the search in Windows 8.1 is not working when you search for files and folders that are not in your libraries or desktop. To make Windows 8.1 search for files and folders stored elsewhere:
- Press the Start button
- Type Indexing Options and click on the Indexing Options program that is found
- Click Modify
- In the Indexed Locations window, select all the tick boxes to enable Windows 8.1 Search to work for all files on your computer
- Click OK -> Close
It will take a while for Windows 8.1 to index all your files, but after it does you will be able to search for any file or folder on your computer.