Installing Fonts
Find a good font site and download your favorite fonts. If you don't know where to go to download some, click [Here].
After you've downloaded your .zip files, Extract the .ttf files to your fonts folder. Your fonts folder should be located in:
C:\WINDOWS\FONTS (or something similar to that)
Once you have unzipped or extracted all of your fonts, go to the font folder (C:\WINDOWS\FONTS)to "refresh" it so all your fonts are loaded onto photoshop.