GPO Prevent saving to "My Computer" in Windows 7

Hi there,

We have a problem with domain users "losing" work due to saving to "My Computer"

In group policy we "Hide these specified drives in My Computer" and "Prevent access to drives from My Computer" for the C: drive in this location: 

User Configuration\Administrative Templates\Windows Components\File Explorer

How do we stop people saving to "My Computer"? We weren't even aware that you could do this until we started investigating reports of missing files and found them deep in the appdata folder - places like C:\Users\username\AppData\Roaming\Microsoft\Windows\Network Shortcuts

Thanks,
Kieran.