[Krazy_About_Technology]

If you see my post carefully i told you to run the command from an 'Administrative Command Prompt. You'll need to elevate your privileges due to the new feature called UAC in Vista. Anyways, try this..

Open Start Menu, in the search dialog type cmd.exe. On the search result, it will show the file cmd.exe. Right click on it and select 'Run as Administrator'. Now in the command prompt that appears, type those commands. See if that solves the problem.

There is nothing wrong with your Windows Update settings.And yes you dont need the DVD with Vista (Thanks to gx_sauav for update)

@Ponmayilal ^ - The sfc scan that you ran in Win Xp repairs the files and posts the changes it made in the Event Log. You can see these logs in 'Computer Management'. Run the file compmgmt.msc. In the Event log viewer, you'll have a System log. Here there will be two entries for start and stop of scan. In between them there will be a log of what files it repaired.