An extremely good software antivirus.firewall (both are built into each other), would have to be ESET Nod32 antivirus. It's practically the best antivirus out there to date some good focal points on the software is:
The costs for a small business depends on what licensing you get.
For a 5 user license it is 384.95$ (for 2 years)
For a 10 user license it is 769.90$ (for 2 years)
For a 15 user license it is 970.35$ (for 2 years)
Here are some charts on the data collected for various topics by ESET
Here are the features that Nod32 also has.
* Server Installation: ESET NOD32 Antivirus Business Edition may be installed on servers as well as workstations (the Home Edition can only be installed on workstations). This is a critical feature for the competitive business as servers are just as vulnerable to attack as workstations. Should your servers be unprotected, one virus can take down your entire system.
* Remote Administration: Monitor and administer your security solution from anywhere in the world with the ESET Remote Administrator. This is an absolutely necessary feature for the business with more than one location, or the systems administrator who works remotely.
* "Mirror" Capability: ESET's mirror functionality enables your IT administrator to conserve bandwidth by creating an internal update server. This prevents employees from accessing the Internet for updates, conserving resources and reducing exposure to threats.
The requirements for Nod32 are as follows.
* Processors supported: 32-bit (x86) and 64-bit (x64) IntelŽ, AMDŽ or 100% compatible
* Operating Systems: Microsoft Windows 2000, Microsoft Windows XP (32 and 64-bit editions), Microsoft Windows Vista (32 and 64-bit editions)
* Memory: 33 - 38 MB on average
* Disk Space (download): 16MB
* Disk Space (installation): 78MB
There mech, hows that ?
And now I'm off to bed, pm me if you need anything else :P