after you remove it through the control panel you will also need to manually delete some imvu files that won`t uninstall through the control panel.
click-start-search-files and folders
then type IMVU where it says search all files and folders. after it is done searching it will show you a list of imvu files still on your computer.put your cursor over each one/right click and click delete do that for each one to remove it from your computer.
In the future do not run the setup or visit the site.