I have already installed IMVU, but when I go to start, it says I need to upgrade it, but the upgrade crashes the program.Try using Revo Uninstaller. Even if it can't uninstall the application normally, it will force it to uninstall by wiping out all traces of its presence from the system. Once the uninstallation and cleaning part is over, download the updated client from the website and install it. It should work this way.
IMVU is a new way to hang out and have fun with your friends online!
Just like an old-school text-based messenger, you download IMVU's software onto your PC. But with IMVU you create your own avatars who chat in animated 3D scenes. Check it out and experience 3D chat for yourself!