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Windows Vista introduced the User Access Control (UAC) feature to improve security for the end user, however if you are an experienced power-user it is quite likely that you find UAC extremely annoying.

Fortunately, disabling it is very straight forward (although I would not recommend doing this unless you are aware of the consequences).

First, load the MS config utility by typing "msconfig" in the run box (Press WINDOWS KEY + R to access this) then click OK:
Once MSConfig is loaded, click on the Tools menu then select Disable UAC in the menu then click OK:
This will then run a script to disable UAC, which requires a restart to complete. If you wish to re-enable UAC, simply repeat the above steps but click Enable UAC instead.