If you installed them right, there's no reason it shouldn't work. Installing them right, in this case, means FTP'ing the 'admin' folder in the mod to the root of your site and letting the folders and files inside fall where they may.
One word of advice - if you have 'lots' of mods to install, install them one at a time (to a test Zencart installation) and test them thoroughly before you install the next. Not all the mods work well with each other.



