Download the compressed font file to your desktop (.zip for PC's, .zip, .hqx, or .sit for Mac) and extract the files inside with the free programs Winzip for PC, or Stuffit Expander for Mac. Place the uncompressed files on your desktop then...

For WINDOWS XP:

Close all running applications.
Click on: START / CONTROL PANEL / FONTS
In the Fonts window click: FILE, INSTALL NEW FONT.
Then select: Your C drive / DOCUMENTS & SETTINGS / (YOUR PC USER PROFILE) / DESKTOP
Select which fonts you'd like to install and click OK.
You may now safely delete leftover files from your desktop.
Re-open your programs and the fonts should be available for use.

For WINDOWS VISTA:

Open Fonts by clicking the START / CONTROL PANEL / APPEARANCE & PERSONALIZATION / FONTS
Click FILE / INSTALL NEW FONT
If you don’t see the File menu, press ALT.
In the Add Fonts dialog box, under Drives, click the drive where the font is located.
Under Folders, double-click the folder containing the fonts that you want to add.
Under List of fonts, click the font that you want to add, and then click Install.

For MAC (OS10 and above):

Close all running applications.
Click on: HARD DRIVE / FONTS
Drag the uncompressed font files into the FONTS folder.
You may now safely delete leftover files from your desktop.
Re-open your programs and the fonts should be available for use.

Install only one file-type version of any given font (either the Truetype [mac/pc], Postscript[mac], or Opentype [mac/pc]).