Major Update Patch Failing

Hi

I'm trying to generate a patch to apply a major update
which is failing.

I apply it through an msiexec /p statement with
RESINTALL=ALL and REINSTALLMODE=omus flags.

I've generated a log file and can see no errors
contributing to the failure.

What I do get is this:
Action start 16:47:55: InstallValidate.
MSI (s) (7C:30): Feature: DefaultFeature; Installed:
Absent; Request: Null; Action: Null
MSI (s) (7C:30): Component:
C__00C9B5BC5DC8459082A816FA67262B61; Installed: Absent;
Request: Null; Action: Null

Where its saying the default feature is absent and the
resinstall request is not being applied. It then goes on
to say all the components are absent and doesn't apply
any changes.


Any ideas of what I should be looking for here?

Andrew