Dr. Guard is a fake security application. This rogue prevents legit softwares execution, displays fake alerts and warning messages. Dr. Guard also detects non existent infections to scare users. It is from the CoreGuard family (Paladin Antivirus copycat).
The rogue contain Malwarebytes MBAM database, but Dr. Guard is unable to work with it as the engine is not optimized to use the stolen data.
If your PC is infected with Dr. Guard use MBAM to remove the infection or follow Bleeping Computer's removal guide.
Thanks to Malekal Morte.