I've installed an animation package called Movizu, but when I try to run it I get a little box popping up saying "fatal error!" which sounds rather drastic. There's also three "filename not found" messages. Should I uninstall and try again? If so, how do I uninstall it?
Cheers.Yes, start by reinstalling. Precisely how you do that depends on what operating system you're using (which you don't mention). Many packages install an "uninstall" icon in the Program menu in WINDOWS, so try that first.

If you've paid for this application, you should consider contacting the software COMPANY for support, if it still doesn't work.I'm using vista, and have uninstalled and reinstalled the program (it's a freebie so no money lost), but still GETTING the same error message.Do the "filename not found" messages indicate which files are missing?

When you install the program, try right-clicking on the installation file and CHOOSING "Run as Administrator". If that MAKES no difference, the first time you run the program, try right-clicking on its icon and choosing "Run as Administrator".