Trainz Back-up

I have copied Trainz from the c drive to the e drive. When I run it some of the content I downloaded does not appear in "my collection"
I have tried to load trainz from the CD to the e-drive but it wants to remove the current copy of Trainz on the C drive which would be a disaster. It does not give you the choice of drives ...any Ideas
I have UTC TRS2004 and TRS2006 and UTC is definatly my favourite.
If you move the content folders (world for UTC & '04, 'local' for '06) out of the way, you can un-install and re-install without fear of losing your content. It can then be moved back into place in the new installation. '06 will need to re-build the database, but the others should find the content immediately.