The installation source for this product is not available. Verify that the
source exists and that you can access it. However this seems to be an "add or
remove programs" error message rather than one from the installer itself.
Just to summerise
I click remove
Setup asks for disc
I enter the disc
Then comes up with "The feature you are trying to use is on a network
resource that is unavailable" error message and gives option to browse for it
I click ok
"The installation source for this product is not available. Verify that the
source exists and that you can access it." is displayed
End.