I was using ACDSee 7.0, but since a HDD headcrash I can no longer use this program. (i can't find the registration serial number, which was a txt file on the Same HDD

A Colleageu pointed me to XnView from which he said that it probable would fullfill my needs
ACDSee had a nice feature that helped me with finding duplicate images. It scans a folder (and underlying folders) for duplicate images and reports them.
It also gave me the opportunity to instantly select which duplicates to remove
Does XnView have this functionality (meaby "Compare Images"?)
Best Regards,
Th.N. Groen