Thanks for your reply balihr!

I am not sure if I've not explained my errors completely. In my local computer development site, I installed the plugin with just the stock demo data in Zen Cart v.2.1 and it installed correctly and I had the ZX Slideshow and could add slides under Admin->Tools.

When I was done testing on the development site, I installed my current live site database and this is where the Admin->Tools-> ZX slideshow has now disappeared.
I then uploaded my test site and updated database to my server (under a subfolder) to again, test everything and I still have this same problem of the plugin being installed and able to edit the plugin in Admin->Config->ZX Slideshow (attached screen shot) but still no option in Admin->Tools

Here is the screen shot of my server (subfolder) site:

Click image for larger version. 

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As for uninstalling a previous version....I only added this new version to a stock Zen Cart v.2.1 during upgrading. It worked fine until I added in my live site database.

Hope this helps to further decode the problem and how I can fix this...

Thanks again!