I want to remove some right click entries or somethin' but I don't know what part of the registry

There are free programs that will allow you to do this. I haven't tried them, but here is a link to one:

http://www.nirsoft.net/utils/shell_menu_view.html

Or you can hack the registry yourself - not something I would want to do.

http://www.jfitz.com/tips/rclick_custom.html

Have fun