HP does not even list a 2000C under their downloads section, do you mean a 2200C maybe? There are no drivers past XP for this model, if Windows 7 does not detect it, you won't be able to use it.
The 2300C does have Vista drivers, which sometime also work with Windows 7, if you have that model, try the Vista drivers. Heck, you may as well try the 2300C drivers even if you have the 2200, you can't really break it that way. The only thing you may get is the "no compatable hardware found" error.