Insert the XP CD or the System Restore CD exit out of any wizard that comes up. Then click on Satrt>>Run then type, sfc /scannow then hit enter.
That will restore windows and any corruptions or missing files.
Note the space between the sfc and /
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.