Can someone help me out here, i mined from the beginning day one, but stopped mining years ago. Never looked at my coins again and kept them on my PC. Now i cannot sync the wallet. I need a new one, can i backup the DAT file, install a new wallet and put the old dat file back?
You could backup the Wallet .dat, install the new Wallet on top (of the old one) and let it sync. It´s not necessary to re-import the .dat file.