It happens sometimes, when certain antivir gets updated with new weird database and starts to block things, or you or someone else changed certain windows settings, window is also receiving updates to own software and may end up with breaking things. Check if you are admin and running the installer in admin mode, check if you have permissions to the files in res_mods and mods. Try to explain what happens on that picture you posted, I'm too busy to search for some details on it.