I have a BlueStacks application installed on my system with Windows 7.
I have installed WhatsApp, which i didn't want any other user on my system to use. so by mistake while asssigning permissions from Properties » Security, I added Permissions denied to administrator also (for read, write and execute).
So now, if I try to open the application, it doesn't open, saying I don't have permissions for the application file; it also doesn't allow me to change the permissions from Properties » Security, saying
You Do not have permissions to view or edit this object's permission settings