hello again Ray.
Thganks for your efforts to assist me with the problem
Today I finally solved the thing!
Sometime before trying to remove the last clips, I had deleted QuickTime from my PC, thinking that since I hadn't used it , I wouldn't need it. Anyway I had reinstalled it again after finding that I needed it to run some program that my Granddaughter plays on.
Well, it turns out that the program I use for making the movies Cyberlink Power Director utilizes Quicktime.
Trying again to remove the clips today, well, Bingo. All gone!
Maybe someone might find this long winded info useful.