I downloaded the most recent version of iTunes and now it won't launch

I have a PC with over 800 gb of space, most of which is unused, and am running Windows 7, and when I opened iTunes (which opened and worked just fine) I was prompted to download the most recent version of iTunes and iCloud.  Upon completion of the download, which indicated it was successful, I had to restart my computer.  When I tried to launch iTunes this time, I got two error messages:  "The procedure entry point ADAdPolicyEngine_DidEnterStation could not be located in the dynamic link library iAdCore.dll"   and   "iTunes was not installed correctly.  Please reinstall iTunes."
Last summer I got to the point where I was unable to access iTunes at all and worked for weeks with Apple support to correct the issue to no avail.  I had my computer in the shop and they were able to clean up a couple of corrupted files, and thereafter iTunes worked great.
I'm afraid to uninstall iTunes for fear I'll never get it back.   Anybody have suggestions?
Thanks,
Littleredz24

P. S.  Just got brave and uninstalled iTunes and re-installed it.  Got the same error message:  Entry Point Not Found - The procedure entry point ADAdPolicyEngine_DidEnterStation could not be located in the dynamic link library iAdCore.dll
Now I can't get to iTunes at all.  Help, please!
Littleredz24

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