ADOBE FLASH PLAYER. If you don't already have the most current version of Adobe Flash Player, you will need to download and install it on your computer. This free download is quick and installation is easy. Visit Adobe's website for your free version.
VISIT HULU. Hulu.com hosts a massive collection of television programming, available to watch online for free. Among their many offerings is an impressive selection of classic cartoons. Watch "Rocky and Bullwinkle", "Fat Albert", or any of their great old cartoons for free.
YOUTUBE. If you can't find the classic cartoons you want to watch online at Hulu, try Youtube. The quality of video may be a bit inferior (or not), but YouTube provides the most diverse collection of member favorites available on the web. Watch obscure and outdated classic cartoons for free on YouTube.