Can I manually remove MS Virtual Servers applications called "Virtual Machine Additions" versions 13.206 and 13.552.0.0 on a 2003 Virtual Server, add remove will not work

I have a 2003 R2 SP2 Server that is hosting Microsoft Virtual Server 2005 R2.  On that host we have a 2003 Virtual Server client that has 2 versions of Virtual Machine Additions installed that need to be removed before it can be migrated to Hyper-V, but the Add/Remove will not work on both versions.  Get 2 different errors on them.

Versions: 13.206
Error: Looking for original msi, not available and did not find anything in the registry, also tried msizap but will not remove.  Did google this version but not available any place as of rigth now.

Versions: 13.552
Error: The installation source for this product is not available.  Verify the source exits and that you can access it.