Shin,
I accidentally deleted my program that allows me to watch online videos (like You Tube). Is there a site that lets you download it for free like many do with Adobe?
Hmm.. Usually if you're missing a plugin, your browser prompts you for it.. Did you say you had a Mac? This might be more difficult than I thought.
For Youtube for a PC it uses 'Flash', which one can download for free from the website.
For a Mac.. I'm sure you can download whatever they use there, perhaps Flash too, for free. Definitely for free. I'm just not sure what you use and where you get it.