Make your Vista's admin account works as Real Administror

For Windows Vista Ultimate /Bussiness/ Enterprise:
1- Click Start, and type "secpol.msc" in the search area and click Enter. (You may receive a prompt from UAC, approve/login and proceed)
2- In the left list, choose "Local Policies", then "Security Options"
3- Set "Accounts: Administrator account status" to Enabled.
4- Set "User Account Control: Admin Approval Mode for the Built-in Administrator account" to Disabled.

For Windows Vista Home Basic / Home Premium
1- Click Start, and type "cmd" in the search area, right click on "Command Prompt" and select 'Run as Administrator".
2- In the command prompt type "net users Administrator /active:yes" (Note the capital "A" in Administrator) and press Enter, you will get a confirmation as "The command completed successfully".
3- Click Start, and type "regedit" in the search area and click Enter, navigate to: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]Double click on "FilterAdministratorToken" and set it to "0"