configuring virrtual machine

Dear Experts,
I'm working on windows 7 virtual machine, I need to increase the Ram associated with the XP mode, but when I ever click on the
 Settings¿ memory,  I found the textbox disabled and the  amount fixed to 512 M, I like to increase it to 1025, (my host OS has 4 GB) but I can't do it ?
Help please
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Here you go:

Can not edit RAM size while VM is running.  Follow the tutorial there for shutting it down, but keeping the window open to make settings changes.

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You can also just go to Start->Programs->Microsoft Virtual PC ->Virtual Machines, right click the VM and hit settings.  Edit the RAM settings.

(VM must be off)
Amanda77Author Commented:
thanks alot
very clear steps
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