1. Open "Start Menu"

2. Click on "Control Panel"

3. Click on "Change keyboards or other input methods"

4. Click on "Change keyboards"

5. Add new keyboard input

6. Choose desired layout e.g. United States-Dvorak and click "OK"

To use Colemak or Workman you probably need to install additional stuff before:

• install colemak
• install workman

7. Apply changes

8. Open keyboard preferences

9. Switch to currently created keyboard layout