Dec Software is a software developer for Windows.
It is reported that the following Windows processes are part of ThumbnailExpert:
If you want to remove ThumbnailExpert from your computer, just go to Start > Control Panel > Add/Remove programs and select ThumbnailExpert from the list of programs.
It is reported that the following Windows processes are part of TC4Shell:
If you want to remove TC4Shell from your computer, just go to Start > Control Panel > Add/Remove programs and select TC4Shell from the list of programs.