Windows has a built-in search facility. You can use the search box in Windows 10, for example, to search for a word or phrase in any of your files. However, the feature relies on an index that Windows builds when you first install the OS and which it continues to update all the time. Which can slow down your PC. So many people, myself included, elect to turn off file indexing within Windows.
If you want to do the same, open Explorer and right-click on the drive C icon. Choose Properties, and then untick the option for allowing the drive and its contents to be indexed. But be aware that choosing this option will require Windows to make a tiny change to the properties of every file on your computer, so you won't be able to do anything else for a few minutes while this takes place.
With indexing disabled, you need a different way to search all your files. And if you don't use the search feature very often, then there's no point in maintaining an index. It's easier to use a program which will search every file for the word or phrase you're looking for, without needing to consult a huge index database.
My favourite tool for doing this is Astro Grep. It takes its name from Grep, the unix/linux program which does the same thing.
You'll find Astro Grep at http://astrogrep.sourceforge.net/download/ and it's a 0.8 MB download. It comes from a site which is rated as reputable by Web of Trust. Note that VirusTotal flags it as suspicious, but only from 1 of its 62 virus scanners, so I have no doubt that this is a false alarm and that the program is perfectly safe.
Once installed, just enter a folder to search, and a word or phrase to look for, then sit back for a few seconds as Astro Grep does its work. So if you remember writing a document but you don't know what name you saved the file under, Astro Grep will save the day every time. It really is an incredibly useful program to have around.
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