I just got ZA anti-virus/firewall last night and after installation my system booted up and froze, I had to hard boot and when I restarted the system would not boot any of my start up programs. I had to uninstall zone alarm to get the system back to normal boot. I had avast installed but it was not active at the time, I uninstalled it and it happened again. The cycle repeated like this at least 4 or times and I finally just left it uninstalled. Im not sure what I need to do, I always told it to disable the antivirus as I had avast and I just purchased it for a firewall. Im running windows 7 64 bit. Any help appreciated.