Lock The Taskbar Permanently:

We can right click on the taskbar and toggle the 'Lock the taskbar' option. If the taskbar is not locked you can edit the size of taskbar.
Now how if you want your taskbar to re-size to a certain size and then lock it so that nobody else can unlock and re-size again. [Specially in Windows Vista where we have thin taskbar]
Here's how you can do it:

Click on Start > Run OR press Windows-key+R.
Type regedit in the field and click OK. [You must have Administrator access].
Now Navigate to the following registry:
HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Policies/Explorer
[Navigate to the same registry under HKEY_CURRENT_USER if you want the effect only for the current user account].
You will find 3-4 keys here.
Now here we need to create a key. To create the key follow these steps:

• Right Click and select New > String Value
• Name it LockTaskBar. Double Click and open it.
• In the value data field, give the value 1 and press OK.
• Now Right-click your taskbar and see, now you cannot toggle the lock.

Note: To reset it, set the value to 0 instead of 1 OR Delete the key.
Be very careful while editing registry. Serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully.

Posted in: Window's Trick's