All the googling I can find says "Uninstall MSDE" (SQL Express 2000). There's no such thing, and I don't want to go uninstalling the original SQL server for obvious reasons. This is whether I go through Capita's migration process or straight to SQL Server 2012 Express installer. It extracts files, the first page loads (Installation Center) then clicking on "New SQL Server stand-alone installation" gives us a popup with the above failure.
Anyone come across this? I've disabled everything I could think of that may have caused issues like the RM auditor databases etc.
Right, this can be disregarded. It was indeed an MSDE instance!
So for those of you with a CC3/CC4 server which is also your SIMS/SQL server, you'll find your RMAUDPRINTERCREDITS database thingy is the cause. Uninstall from control panel (its under the RM Printer Credits Database) and bob's your uncle. If you use printer credits, find a working solution instead!