How do I change my component GUID in wix?

When should I change or not change my component GUID in WIX? To clarify, the question deals with when a component GUID should be changed for an MSI component. A component can change with aspects such as: changed destination path, addition or removal of files to/from the same component, addition of registry data etc… This causes problems with regards to the so called component referencing. Any help will be appreciated.

Anyone have a solution? Please help .