If you are referring to the progress you have made in your career, you have to have the game re-installed in the same folder, with the same mods activated, and still have all of the old data available. If you had to install a new hard drive, then on the old hard drive, it would be the old "C:\Users \UserName \Documents \SH3", unless you changed it with MultiSH3 to use a different Save folder. If you have a new "C:" drive installed, and the old drive is still available to use, when you connect it to the computer, it most likely wouldn't be "C:" drive any longer, but maybe D:, or some other letter, depending upon how many other drives you have installed. If the old data is not available, then you would have to start a career all over again, in whatever year you want to.
