How to Reinstall a Corrupt DLL File

Insert Your Windows Disk
1. Insert your Windows CD in the drive and restart your computer.
2. Push any key on your keyboard at the prompt that says, 'Boot from CD.'
3. Wait for the Windows setup to load the file system.
Windows XP Users
4. Press the 'R' key on your keyboard once you are at the page titled 'Windows XP Setup.'
5. Choose option '1' to select your Operating System and press 'Enter.'
6. Type the Administrator password for your computer. This is typically the password you use to access your Windows XP account. If you do not have a password, just press 'Enter.'
7. Type: expand d:\i386\X C:\Windows\system32Note:
X= the name of the corrupted .DLL file you want to repair.
D:\= the CD\DVD drive letter. Most single hard drive computers use 'D' as default.Press the 'Enter' key to execute the above command and then press 'Y' on your keyboard when asked to overwrite. Reboot when finished.
Windows Vista and 7 Users
8. Click 'Next' after choosing your language on the Windows setup.
9. Click on the 'Repair Your Computer' link.
10. Highlight your operating system in the list and then click 'Next.'
11. Click on 'Startup Repair' on the 'Choose a Recovery Tool' page and the DLL files that are in your Operating System will be replaced by the ones on the Windows disk. Reboot when finished.