Alright another quick and simple one so let's get started.
First you need to choose a font or several that you want to get.I like http://www.dafont.com/ because it has a good number of decent fonts and you can always find what you're looking for.Go ahead and download one.

You're going to need an archive manager such as Winrar or 7zip so get one of those if you already don't have one and extract it somewhere.
Navigate to where you extracted your font and cut it and paste it in C:\WINDOWS\Fonts or just drag it in.
And we're done.

Now you can use your fonts for example on Photoshop.Just start up the text tool and look for the name of the file you downloaded.