How to repair dll files missing

Foremost get Windows XP CD/DVD into the CD/DVD Drive 

Step:1 - Click on Start

  

Step:2 - Click on Run

Step3 - then type this command :

sfc /scannow

Step:4 - Then click on OK.

Wait until the process is complete 

This will check all your Windows system files to see if they have been edited or changed.

If they have, it should be able to replace them with backups, but if it can not find them on your hard drive so it will be necessary to copy from your Windows XP CD or DVD.