I'm pretty sure you need to actually do a complete uninstall. Renaming the directory won't suffice. Reloaded seems to put stuff elsewhere (as evidenced by the fact that it shows recent maps from Classic in the file drop down if I have used something there recently). I just copy my media to the desktop as a backup, uninstall, then re-install the new version, then put my media back. The new installer shouldn't touch any personal media and hasn't for me, actually, but it's the uninstall that is most important! Good luck!
MAME Cab PC: i7 4770@3.4Ghz (passmark 9945), 12GB RAM, Win 8.1/64, GeForce GTX645 (passmark 1898); Shiny new laptop: i7 4800MQ@2.7Ghz (passmark 8586), 16GB RAM, Win 8.1/64, GeForce GTX870M (passmark 3598); Old laptop: i5@2.3Ghz, 8GB RAM, Win 7/64, Intel 3000 graphics