It might be easier to disable EasyShare from running at Startup. You don't say which OS, but assuming you are using Windows, eg XP or Vista, then the Startup list is held in the "Run" commands in the registry.

The Microsoft link below may help with disabling these startup files;

That might stop guests from accessing the photos, but any other Administrator account will be able to find these photos. So may be you need to move them off the computer?