As a side note of further info on the situation, this is copy & pasted directly from where/how I installed ZenPhoto on Dreamhost.
Install new website software - Easy mode
(In easy mode, you cannot access the files for the installation (so you can only use the themes/plugins/languages we've included), but installation, upgrades, and maintenance are all handled for you!)
The only way to uninstall it would be to completely destroy photos.chrisisaint.com, it would destroy the domain and everything on it from what I've been told