Desktop files etc. won't open after botched software install
(a) My new mac mini is just up and running since yesterday. I'm not new to Mac but AM new to setting up, installing, etc., and to being the one responsible. (My brother-in-law used to do everything for me, but he moved, the heartless you-know-what.) Anyway,after a few false starts, a "mini" nervous breakdown and one complete reinstall, things were humming. I was so happy with the Mini -- and, I admit it, with myself. But pride goeth before a (downloading) fall...
(b) Since I successfully installed an old copy of MS Office 2001 (after installing OS 9), I decided I could be trusted to install a old copy of Photoshop 5.0 (used previously on my G3/OS 9.2). The disc icon appeared on the desktop, but nothing happened when I clicked it. So, freaking idiot that I am, I remembered recently reading about the "drag to the hard-drive" Mac method of installation...
(c) I dragged it, alright, and it disappeared into that cute little hard-drive icon... and, just like that, i-life as I knew it was over. (Remember when Kevin Bacon flips that fateful switch on board Apollo 13? Everything had been going so well...) Now, none of the desktop icons -- the hard-drive, the printer, various Word files and folders -- will open. (They highlight with one click but don't do anything with 2 clicks.) I can't seem to get into them any other way, either, but again, I'm new to OS X, and to being the one in charge. SO, I have no access to MS Office, or to my Word documents or to numerous folders of art and photos.
(d) I've searched as best I know how through these Discussions for a similar problem but have had no luck. I've never posted to a forum in my life, but I've admired you all from afar. (I figured out what display to buy from reading here.) I hope I am posting this right; I don't really know how this topic/thread stuff works. (Be gentle on me -- and educate me --if I'm in the wrong place.)
And finally, MY QUESTION: Can my downloading error be reversed?
Thanks so much in advance (you deserve much more just for reading this). Peace and love!