BTW, Windows 7 download is still available online and so grab it whiles it there. The beta will work without the Product key for 30days. There's a hack to make it work till 120 days.
Here's a registry hack on how you can bypass this check and enable Aero
1. Click on Start and type regedit at run
2. Go to the following registry key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\DWM
3. In the right details pane, create following Three DWORD (32-bit value) entry
- UseMachineCheck, and set its value to 0.
- Blur, and set its value to 0.
- Animations, and set its value to 0.
4. Close Regedit
5. Click on Start and type CMD with administrative Priviliges
6. Now type following command to stop and start Desktop Window Manager Session Manager.
- Net Stop uxsms
- Net Start uxsms
7. Now Enable Aero by right clicking on desktop-> Personalize ->Windows Colors.
This Registry Hack to enable Aero in Windows 7 can also be used on Windows 7 install on Virtual Machine like Virtual PC 2007 but this wont work on Vmware Player which doesn’t have DirectX 9 or support physical machine video Drives.