I've had quite a few apps not install without turning off my antivirus, including EZDok and RXP's GTN 750. The 777 was no different when I tried installing it this morning, but I had to go an additional step and turn off my firewall as well (which I admit was kind of unsettling). Still, I've known these monitoring program to be a little too sensitive with not only these types installs but in dozens of other legitimate programs too so this sounds like just another false-positive. Still, if you're uncomfortable with turning them off, maybe you can get a refund.