Yeah, you really can't "copy" DirectSOFT from PC to PC. You need to UNINSTALL whatever is there (5.2/5.1/whatever), then do a CLEAN install of the software using the purchased installation key.
Actually, you need to UNINSTALL it from BOTH PCs to properly transfer the license.
You should copy your PROJECTs folder across from your old drive AFTER you have installed it on the new PC.