Turn Off User Account Control

Disable User Account Control in Windows Vista.
The easiest and most common way to do it is via Method #4 in the above link (via Control Panel).

Well, it's not recommended, but you can Disable The New Vista Feature Of User Account Control:

1. Click Start and click Control Panel.
2. Click User Accounts and Family Safety.
3. Click User Accounts.
4. Click Turn User Account Control on or off.
5. Click the box beside the Use User Account Control (UAC) to help protect your computer option to remove the check mark.
6. Click OK.

You can enable UAC once again by following the steps above.