The usefulness of Windows Search Indexing is disputable enough. You lose PC performance, a part of free RAM memory and speed access to Hard Drive(during the work of Search Indexer) for possibility to fast search of a file on your hard drive. It is possible to disable and turn off search indexing to speed up the system speed by freeing up CPU and memory which is used to perform the indexing task. Disabling does not mean you can't use Windows Search but it does mean searches will take more time.
To disable it:
Disable Windows Search Service:
Run WinTools.net and select System Services point of MS Tools menu:
Or press Windows + R buttons of your keyboard, type services.msc and press OK.
In the list of Services mouse double click on Windows Search entry. In the popped up Dialog press Stop button, select Startup type: Disabled to permanently disable the indexing service so that it won`t run again and press Apply button.
Disable Indexing on Drives:
Click on Computer. Right-click on any disk you do not want to be Indexed. In the General tab uncheck "Index this drive for faster searching" and click Apply.
In the resulting window choose Apply changes to drive X:\, subfolders and files, click OK and ignore everything for any error messages.
Do it for all hard disks.