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Hi Parryg,

I have found what was causing the problem . It was Google Talk plug-in which was installed and causing problem. I have un-installed it and now I am able to run VM with 4096MB RAM.

Thanks for all your help.

Thanks,
Praveen

Sorry my last observation was incorrect. It was not "Google Talk Plugin" which was causing this problem.

Today morning after I rebooted my host and attempted to start guest, it again crashed.

There is another service which was blocking guest machine to procure RAM. The service display name is "McAfee Host Intrusion Prevention Service" and service name is "enterceptAgent". The executable it uses is "C:\Program Files\McAfee\Host Intrusion Prevention\FireSvc.exe"

After stopping this service everything is running smooth.

Thanks,
Praveen