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LISTEN-UP!! Good news from Grandpappy,yes,I have solved the problem of being unable to delete a file off my desktop. After 2days I hit upon a prog called 'Unlocker' - downloaded the latest version from Hippo and after installation, the file was gone with one click!!
It's a free program by a chap called Cedrick Collomb.
Had I been able to submit pictures I could have explained the problem more effectively,but 'all's well that end's well'.
Cheers everybody for trying to help.
PS. Just Google 'Unlocker' and you also have the program for future use.