Error "Access is denied" when you try to Task Manager Users tab in Windows Vista

Point 1.

Open Task Manager (taskmgr.exe) and click the Processes tab
Click Show processes from all users
When you are prompted for an administrator password or confirmation, type the password or provide confirmation.

(Task Manager now runs with administrative privileges.)


Point 2.

Click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator.
If you are prompted for an administrator password or for confirmation, type your password, or click Continue.
At the command prompt, type taskmgr.exe, and then press ENTER.

(Task Manager starts with administrative privileges.)