Hi,
   I am looking after the tool which scan latest viruses,worm and malware with out getting installed in clients.
Tools which will scan network with IP range just like angry IP scanner.
Please help to get such tool.

Thanks in advance

The only reason that Angry IP scanner can work is that it is looking for what services are listening on the target host/s.
A lot of viruses/malware don't listen on the target host/s; and I would guess that most worms are not following usual protocols, so scanning infected hosts with listening ports is not going to give you reliable results.
There's at least one tool I know of which does what you want, but it only does it for one worm: eEye/Retina's Sapphire SQL Worm Scanner.  I think they did one for Nimda also. 

nmap should be capable of doing this with the nmap scripting engine (NSE). Might be a steeper learning curve than some of the vendor tools out there.

I'm about to checkout the new nmap text, let me know if you peruse it. It looks good.

If you're looking for specific exploits or certain traffic, you can always resort to some fancy Ethereal filters. I used that when some of the clients I had were infected with the Welchia/Nachi/MSBlast worm.