This people acting as if it's their first time using Microsoft Product. They're complaining about Vista's UAC (User Account Control). Disabling it is not a good idea, but we can still minimize the annoying effect of secure desktop by disabling it (I suggest you to keep using UAC because it can improve the security).
Here are steps to disable UAC Secure Desktop:
- Click Start -> Run type “regedit”
- Go to key [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]
- Find a key PromptOnSecureDesktop and modify the value into 0
- Restart your computer
And the Secure Desktop won't be there when the UAC popped-up.