Regardless of whether or not you have VMWare Tools installed, you won't be able to use Aero while using any sort of virtualisation software (ie: VMWare Fusion, Parallels, etc). The only way to really do it on a Mac is to install Windows via Boot Camp. However, even if you take the Boot Camp route, Aero will still be disabled if you try and start up the Boot Camp partition using Fusion - basically, it needs to be running natively, not virtually.
That doesn't really matter if it's VMWare Fusion though, it's still virtualisation software in the end. What I said above is from experience on a MacBook Pro with the 9400 and 9600 chips. Installing VMWare Tools will have no use at all, nor will installing the Boot Camp drivers (unless they plan to use Windows natively using Boot Camp, which is currently the only way to use Aero).