Won't install anymore

Dear Robin,
There was a pdfcmon.dll in my windows\system32 folder.
I stopped spooler, deleted pdfcmon.dll, restarted spooler.
I ran the install command as seen in attached image file.
Do you see any mistakes?
It's so bizarre. I routinely upgraded PDF creator without a hitch for nearly a decade.
I also donated once because I was pleased.
Disheartening. Why does it report monitor installed if I deleted it?
Edward