Uninstalling Adobe Reader Version 9.1

My computer is running Windows XP Home Edition SP3. I downloaded the latest Adobe Reader version (v10.1) hoping to install it on the computer. When I went to Add/Remove Programs in Control Panel to remove my current Adobe Reader version (v.9.1), I encountered an error: "This patch could not be opened. Verify that the patch exists and that you can access it, or contact the application vendor to verify that this is a valid Windows installer patch package." What should I do?
