Uninstall Boot Camp
Run Microsoft Installer Cleanup Utility
Sometimes you update by first removing the old version
You may want to run CCleaner as well.
Select All - send to Recycle Bin
Those two should be done as regular household cleaning maintenance
The Windows Installer CleanUp Utility is designed to allow you to safely remove Windows Installer settings from your computer in the event of a problem. Although the Windows Installer is designed to be very robust, it is possible for Windows Installer to become damaged if:
- Your computer's registry becomes corrupted
- You or someone else inadvertently changes a registry setting used by the Windows Installer, resulting in a problem
- The installation of a program that uses Windows Installer (for example, Microsoft Office 2000) is interrupted
- There are multiple instances of Setup running simultaneously, or an instance of Setup is "blocked"
FIXIT: The new utility that replaced Windows Installer Cleanup: