Right click the files and check properties. There's a setting where you can designate a file as "read only". I suspect that you are either opening the file from a read only source such as a back up CD or this property has been set on the file.
On the money with suggestion two Phil.
I copied the files from the backup to my desktop and all is well.
Many thanks and keep up the good work.
P.S. Don't you just love forums..............and the folks that mod them.