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Sorry my last observation was incorrect. It was not "Google Talk Plugin" which was causing this problem. :mrgreen: Today morning after I rebooted my host and attempted to start guest, it again crashed. :shock: There is another service which was blocking guest machine to procure RAM. The se...

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

What have you installed on the host since this decided not to work? As far as I remember nothing new I had installed. What about a virus, have you tested for this? Yes I have scanned for viruses. No virus is detected What about right after a cold boot, will it work then? I didn't understand your qu...

I have un-installed VB 4.1.20 and installed 4.1.18 but vm still crashes with 4096MB RAM.

Also, following Microsoft Office 2007 related updates have got pushed to my host recently. Would those cause any issue?

I have tried to run guest with 1024MB, 2048MB, 3072MB and 4096MB. It crashes only when I run with 4096MB RAM.

Hi Perryg,

This post I had already referred. My google chrome settings are looking fine. Do you have any other clue?

Please see attached file for Google Chrome setting.

I had Virtual Box 4.1.18 previously. Yes, I have Google Chrome installed on host.

No I am NOT using both the guest at the same time.

Hi, I have been using Virtualbox from past 1 year and all Guest I used to run with 4GB RAM.Suddenly after upgrading to VB 4.1.20, Guests started crashing with 4GB RAM. Detailed Description +++++++++++++++++ Yesterday I have upgraded to Virtualbox 4.1.20. Today, when I am running Guest (Windows 2008 ...