Too late! Too late... She cried!
Thanks for that Ridgewood, but I did some Googling in desperation and found that I could just delete those EasyPHP files. So, after backing up, I did and all seems okay. Just lucky I guess. Didn't actually do it through a reg. edit. Not that brave.
Anyway, I suspected that I had to use a command prompt, but wasn't game until your confirmation. Have done as instructed and I have MySQL running, but in the admin under environment ->ODBC, I have the message: "Not Found. Driver 3.51 missing." So-o I guess I deleted a driver that had put itself in that other EasyPHP file and it has now gone.
In view of this, would it be best to uninstall XAMPP, clean up again and reinstall it?