Why is it that when I install 2 security applications in the same computer, both don't work?

Iv'e installed Zonealarm Firewall, and use the free Norton Spyware Scan that comes with the Yahoo Toolbar.

They are 2 completely different types of security, but why is it that when both of them are installed, neither work? I uninstalled both of them, and tried one at a time, and they work properly then.

I'm going to install the full Norton Antivirus, and I need it to work.

Why is it that when I install 2 security applications in the same computer, both don't work?antivirus

Dont install 2 firewalls or antiviruses at the same time as this causes collisions between them and therefore causes your system to crash. Only have 1 antivirus , 1 firewall and 1 antispy . Dont use Norton , use AVG . AVG is free and does a much better job then norton .

Why is it that when I install 2 security applications in the same computer, both don't work?computer

I agree with the first answer. Only install one of any type of security application.

Keep in mind that if you are using a router for your DSL or cable broadband connection, you may have a hardware firewall. Therefore a software firewall really would be redundant and not necessary.

Good luck!
i would keep zone alarm firewall as its the best, i would assume you have the pro or security one with spyware option? if thats the case that would explain the conflict with the toolbar one.