STEP 1 - Go to Start, then Control Panel

FIGURE 1 - Control Panel. Click Programs and Features.

FIGURE 2 - Click to select Jedi Knight: Mysteries of the Sith. Click Uninstall.

FIGURE 3 - Click Yes.

FIGURE 4 - Choose if you want to keep your Single Player saved games. Choose Yes or No.

FIGURE 5 - Click OK. GOG Mysteries of the Sith is now uninstalled.