.tmp files are invariably temporary files created during software install/updates and may have been left behind or not cleaned up if the install/update failed so you should have no problem deleting them. If this worries you then make a copy of the tmp files onto a pen drive or something and keep them until you are confident that their deletion does no cause any issues. A google toolbar is amongst the many bits of junk which many software installs try to add on. When you run an install it's always best to select any "advanced" options during the install process and deselect optional add ons like this. They are not usually viruses, rather something called a PUP (potentially unwaunted program) but anti virus software reports them as unwanted junk.