Game Save or All level played for year can be reload?

My laptop is very old, still running Windown XP (mother board support maximum to Window Vista), I intent to upgrade to Window 8 with new computer.

The question is here, after I reinstall the game from the Mahjong server to the new computer, can I continue the game play, or I need to restart all over again. please advise if anyone knew about this, thank you.

Yes, you can move your save files from computer to computer. By default the save files are in %APPDATA%\.minecraft\saves, just start Run.. and type in exactly that. Then copy the folders inside the Explorer window that opens to the new computer (same path - %APPDATA%\.minecraft\saves, make sure that minecraft was run at least once on the target computer to generate the folder)/