Detecting machines with bots and malware

Hi, i'm looking for an advice on how to use the Network Scanner to detect lan machines that are infected with bots and malware??? Thanks...

I don't think that's really possible. It's not an antivirus product.

One thing you can do with netscan is to look for open ports that are not normally open on your workstations. (i.e. 21, 23, 25, 80, 110, etc.)

Can netscan check for Active traffic on those ports?

I find Netscan comes in handy if your firefighting known infections. just scan for a know rogue remote file, or in the case of Conficker c:\windows\tasks\At1.job

You can also use pskill with commandline added to netscan to kill those rogue process'
Also scan for know rogue regkeys. But as Andrew states, Antivirus should be the first line of defense, with a central logging system