Well, it shouldn't really be necessary to delete them. Once you reach the save limit that you can set in your preferences, Poser will overwrite the files that were already there, oldest first. However, if you are still dead set on deleting them, you should find them at: C:Documents and SettingsAdministratorLocal SettingsTempPoserRenderCache You should be able to manually delete them, but again, you can control how many you save via Edit->Preferences, then on the General Preferences tab, you should see an option for Max Cached Renders. You can set this number yourself. Hope that helped!