Hello Ranjana,
I think you should go with vShield Endpoint 5.1, it's come with new feture such as offloads antivirus and anti-malware agent processing inside guest VMs to a dedicated secure virtual appliance.
Also you can check mcafee and Trend Micro solution for you VMware.McAfee MOVE AntiVirus brings optimized, advanced malware protection to your virtualized desktops and servers. Choose one efficient solution across multiple vendor platforms or an agentless, tuned option for VMware vShield.
For Trend Micro check it, http://www.vmware.com/solutions/partners/alliances/trendmicro.html
http://blogs.vmware.com/alliances/2012/04/vmware_trendmicro_sec.html
I hope it's help to you.