How to change automatic executive programs on Windows startup in Windows Vista?

Change through Windows Defender
 
Using Windows Defender to change the Administrator privileges when the computer is switched on. 

1.Click the Start button, click All Programs.
2.Click Windows Defender in the display area.

3.Click Tools.

4.Click Software Explorer in Tools.

5.Click  Category, choose Startup Program.

Select which privileges to change from the general area displayed in the left part of the page. Click the Disable button.

After setting it to disable, the processes of some programs may be affected. If the Disable button is gray, it means the Disable button is unavailable.
6.When the confirmation window displays Are you sure you want to disable the application? , click the Yes button.

7.Click the Close button to finish Windows Defender.