You can uninstall Designer Pro+ through the Control Panel:
- Click on Start
- Type "Control Panel" and press enter
- Click on Programs and Features
- Scroll down the list to Xara Designer Pro+ and select it.
- Click Uninstall at the top
Follow the onscreen instructions and this will remove Xara Designer Pro+ from your computer.
Once you have uninstalled, you can download the installer again and run the .exe to re-install.