Discussing reinstallation of Windows
Discussing reinstallation of Windows
If these are games in a library system (like Steam or Origin), you can easily relocate the library folder to another drive, and the platform will locate them or direct you after a fresh installation. Regarding programs... it's unclear whether things like MS Office or Adobe require installation and registry changes.
Yes, you can simply drag and drop files between the two hard drives.
Sure, you can move the NMM files to your D drive for easier access.
I own a 240gb SSD that's almost full. I recently swapped in a 2TB drive last year and moved my games there, but I prefer keeping the SSD for Windows and a few essential programs instead of letting random files take up space. Also, I believe a fresh install after three years would be beneficial.