Hyper-v virtual machine cannot start due to no enough memory

I install windows 7 in Hyper-v, which is on Windows 2008(64bits). I gave the very big memory, but it still show no enough memory to start. Please see attachment. Anyone can give some suggestion? Thank you!
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davidy2001Asked:
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Brian HarringtonConnect With a Mentor IT ManagerCommented:
Okay.  That is doable.  Follow the instructions in the article to pass through the Virtualization Technologies to the guest os.  This is only possible with esxi5 or better.

http://www.veeam.com/blog/nesting-hyper-v-with-vmware-workstation-8-and-esxi-5.html
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Brian HarringtonIT ManagerCommented:
Dumb question, I guess. How much are you allocating?  How much is installed on the physical host?
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davidy2001Author Commented:
I tried 1GB, 2GB, $GB and 8GB for it. but all of them do not work. the physical PC have 8GB
RAM¿
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
what are your host and guest memory specifications?
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Brian HarringtonIT ManagerCommented:
do you have execute disable bit and vt enabled in bios?
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davidy2001Author Commented:
Thanks for your fast reply. Sorry, I am new to Hyper-v. what does "disable bit and vt enable" mean ? how can i do that ? go to bios and disable bit and enable vt ?
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Brian HarringtonIT ManagerCommented:
What make/model is the server?  What kind of processor?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Yes those are BIOS settings.

But what memory have you got to play with?
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davidy2001Author Commented:
The physical PC' CPU is AMD and 64bits. and VMware 8.0 is installed on the PC. Windows 2008(64bits) is installed on the VMWare. I already allocated 8GB memory to it. but it can not work
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Brian HarringtonIT ManagerCommented:
Okay.  That makes a difference.  To make sure I am reading this correctly, you are running vmware then windows w/ hyper-v then trying to run a guest?
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davidy2001Author Commented:
I am sorry i was not clear about that. Yes, you are right.
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
you will find this very slow, nested hypervisors.
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Carol ChisholmConnect With a Mentor Commented:
Why not just install Windows with Hyper-V on the host ?
Seems to me you only need one hypervisor.
Hyper-V and esxi are both hypervisors from competing companies.
Unless you have a compelling reason, choose one or the other and don't mix on the same hardware.
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Brian HarringtonConnect With a Mentor IT ManagerCommented:
He's using workstation.  Look at the screenshot.  Until windows 8 comes out, he can't use hyper-v on a desktop.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Windows 8 has been released
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Brian HarringtonIT ManagerCommented:
Not really.  RTM has been released, but is only available through technet or msdn.  It is not available for public consumption.
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davidy2001Author Commented:
i fixed it using WinXP instead of Win7.
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