Do you have the homebrew channel installed?

You can run games from the main menu if we can get preloader installed to block the updates otherwise you will have to run it from neogamma. Who installed the neogamma wad? You should have used a forwarder instead of a full channel so you can update neogamma easily by changing the dol file on your sd card.

Let me know if you have the HBC installed and we can go from there. Also let me know which system firmware you are on (4.1, 4.2, 4.3 etc).