I tried running Disk Defragmenter today and all that happened was a dos window flash briefly on the screen and then disappeared.
When I looked at the Properties for Disk Defragmenter, the computer could still find the Target file, but when I looked at the Properties of the Target file (dfrg.msc) the file it Open With (Disk Defragmenter Module) the icon looks like it's a generic default icon, and so is missing/corrupted.
How can I get this working again? Do I have to reload Disk Defragmenter again? (If so, how?)
Thanks for your advice!