Secure Hunter says: install it … remove it AND the directory … reboot … install again to get it working:
Having issues with Activate Your PRO license please follow these steps
Shut down your Secure Hunter Anti-Malware Software.
Click Start > then go to Control Panel > Programs and Features (Please note that for Windows Vista and Windows 7 you will find ??Programs and features?? and in Windows XP it is ??Add/Remove program??, both in Control Panel.)
Find Secure Hunter Anti-Malware and right click on it
Click ??Yes?? to continue with Uninstall
Click ??OK?? when finished.
 Please go to C:\Program Files (x86)\SecureHunter\ AND DELETE FOLDER
 Please restart that this will remove Secure Hunter service as well.
 Then Install again Secure Hunter Anti-Malware and activate your license