It probably won't appear in the Control Panel>Programmes and Features so can't be uninstalled from there. It may also not even show in Programme Files or Programme Data but they are in your Application Data folders - your own and AllUsers.
Press the Windows key and R together and type in regedit then press Enter. From the File menu, select Export then note the name and location of the backup you're creating in case anything goes wrong. Then navigate to H_KEY_LOCAL_MACHINE\Software and scroll through the list deleting the junk entries. Look at the Microsoft entry and find Shared Tools. Under msconfig, delete anything that starts automatically when the machine is powered up that you don't need to start. Do the same in...