Of course Windows Aero should work in Windows 7 on a PC/Laptop with the specs you've outlined as they exceed the minimum requirements,
BUT you have to work with the fact are not trying to run it in Windows 7 installed directly on that PC/Laptop! You are attempting to get it working in a Virtual PC with its own Virtual Hardware, running with the help of a separate application running on top of that PC's existing operating system.
If you've followed all of the advice already provided by socratis and mpack on getting your VirtualBox settings correct for the Windows 7 installation then try the following Intel Guide on setting up Windows Aero settings:
https://www.intel.co.uk/content/www/uk/ ... 05696.htmlHopefully it will work, but it may not.