Download and install a video accelerator program, especially if the website you like to watch commercials on supports HD or high-quality videos. For example, download and install SpeedBit Video Accelerator free (see resources below). SpeedBit and similar programs remove glitches and improve buffering speeds when watching high-quality videos online.
Update your Flash player. Download and install Adobe Flash Player free (see resources). Some video-sharing websites will not work with an out-of-date Flash player.
Navigate to the video-sharing website you like. There are many websites that stream TV commercials for free, including Metacafe, YouTube, and Break.com. Check the site's video categories for "TV Commercials." Metacafe and Break each have one. Scroll through and click the commercial you want to view. For websites that do not have a specific "TV Commercials" category, try to locate the commercials you want using the "Search" window.