Ok, basically all of that wasn't needed, I basically rebuilt my iTunes from Scratch. The problem IS, that the Apple Software Updates for iCloud replace the common files and updated the coremedia.dll file and the replacements are not compatible with iTunes 11.2.2.3. In some cases other DLLs are deleted or replaced as well, the newer versions removing internal links to other DLLs that are part of 11.2.2.3 but not any iteration of iTunes 12.
I have to use 11.2.2.3 because I remain on iOS 8.4, have remained on it since I saw iOS 9 and decided I liked what I had. I had updated my iPad Mini to 9.0.2 and was forced to update to iTunes 12.something on the PC I was using to keep that backed up. That device is now barely usable, I was sorely disappointed because iOS 8.3 and 8.4 were so good, worked great even on my old iPhone 4S. But mainly, I don't like iOS 9's "App Slicing" which prevents us from backing up our apps right off the device- I keep a large library of my old IPA files, I transfer purchases several times a week. And these are all my IPA files, signed to me, so nobody else can use them. And, considering that updating my devices is a one-way trip, I'd rather have what works best for me than any new gadgets that I can't really take advantage of, not having a 6S and force-touch. I use a 5s now, and iOS 8 is fine.
My final beef with iTunes 12 is that I hate that 12 has removed the Sidebar and right-click functions and moved all of the main functions to some hidden area, which is not as easy to get to as it was in previous iTunes.
So, with that ranting out of the way (which should explain why I insist on staying with iTunes 11.2.2.3) - Here's how I dealt with the corruption. I downloaded Revo Uninstaller from MajorGeeks and I started by removing iCloud, then Quicktime Pro (I have my name and reg code saved), then iTunes itself, all using Revo's advanced option which allows you to remove every leftover file and reg key associated with the apps. I moved on to Apple Software Update, Apple Application Support, and finally Apple Mobile Device support. I left Bonjour and Bonjour Print Wizard, because those don't interact with other apple software. Once I cleared all of the Apple Apps out, I used iCleaner Pro to remove any junk not seen by Revo and remove any Reg Entries that Revo did not get. Boom. Then I rebooted my PC.
I plugged my 5S into the USB port and it immediately found my iPhone and installed Drivers, while at the same time I installed iTunes 11.2.2.3 and it re-installed all of the pieces of iTunes that had been updated by running the Apple Software Update. And it worked, it did not crash right away like it was doing. But this leaves me without an iCloud app, unless I can find a version from the same time that iTunes 11.2.2.3 was released. Because if I install an older version, or a newer version, it will replace needed DLLs including CoreFoundation.dll
Finally, I don't know if I can log in to the App Store in iTunes, I'm afraid to try in case it starts crashing again-- YES! It worked. So I'm all good with iTunes again, my library is intact, it's got four years of backups saved. If the DLL replacement trick works, then do it, it should work for 64 bit systems. But I'm on a 32 bit system. So, the only surefire way yo make sure you can get iTunes working again is by removing every Apple file and reg key for all associated apps. Finally, I had replaced my main HDD several times over the years, right now it's a 1TB Hitachi drive, every time you move your HDD to a new drive, some of your system files get corrupt. But my iTunes was fine until I installed the latest iCloud and Quicktime updates. So, I'll go back to Quicktime 7.7.5. I just need to know which version of iCloud to use and where I can download it. Just remember, use only the Revo Advanced Option when removing the apps, else it will leave a corrupted or replaced file in there, and iTunes installation will just leave it and you'll have to do this all over again.
Thanks, sorry for the large reply.