There are many ways to get infected by rogue antispyware and Windows Activity Debugger probably employs every way of distribution imaginable. It can reach you via spam email, fake online malware scanners, social engineering and even removable flash drives, that get infected while being plugged in into affected computers. It proves that Windows Activity Debugger is a very dangerous rogue antispyware application and if you happen to have it in your computer, you should close the program immediately.
You will also see Windows Activity Debugger perform a fake system scan. Even though it might seem that the scan is real, there is nothing believable about it. The rogue performs the scan, because it wants you to think that Windows Activity Debugger is a real antivirus program, and that it detects multiple infections in your system. Everything is devised to push you into paying for a completely worthless product. Keep in mind, that if you do so, you will open the gate to your bank account for cyber criminals.
Thus you have to terminate Windows Activity Debugger at once, before any of that happened. If you do not know how to remove Windows Activity Debugger on your own, get yourself a trustworthy computer security application that will do the job for you at the same time safeguarding your computer against similar attacks.