HDD Doctor rogue system utility sends bothersome alerts and balloons and reboots your computer every 10 minutes. To stop this activity you have to buy license and get HDD Doctor activation code (they propose you to enter your Email and Activation code).
Use this activation code to get full version of HDD Doctor: C51ECA4062FA.
If this code doesn't work for your, follow the removal manual at http://removal-tool.com/hdd-doctor/