OK! This was my problem.
As stated at the beginning of this thread, I don't know what I'm doing, YET. :)
I downloaded a project from the web which pulled up a dependancy file, Basetsd.h, and I did not know why it was there. (didn't appear with the MS projects !!). So deleted it.
NOT a good idea :rolleyes:
Down to the office, get a copy of the file, install it, and all's well.
The moral: Don't mess with things you don't understand...