There is no direct way with HTML/ASP/
JS etc that you can force a user to install something in a given location, the best you can do is to make a recommendation to them.
The only way to do it would be to download a component onto the local machine, which is then run outside the browser which would drop the files in the correct place. This is however very risky as many people run different systems (Win 9x, NT, 2K, XP, Linux, Mac etc) so this becomes quite hard to code for all.