Recovery file system is missing/damaged

If you've ever experienced Windows system files (like*. dll and *.sys) which is damaged (corrupted) or lost, so that windows can not boot (just displays a message that the file was mising or corrupt xx.dll), then try to follow these steps:
 
1. Restart the computer from the Windows Setup floppy disks or the Windows Installation CD
2. When performing "Welcome to Setup" screen press F10 or press R (Windows 2000 users need to press F10 or R and C).

3. When shown a list of installation and the text "Which Windows Installation would you like to log on to?", Select a suitable number in accordance with the Installation of Windows you want the repair
4. Write an Administrator Password and press Enter. If no password, press enter directly
5. From the display that appears, type the command as follows:
expand D:\i386\xx.dll C:\dir_target
Xx.dll Where is the name of the file is damaged/lost to the recovery, D: is the drive letter for your CD-ROM and dir_target a target directory, then hit enter.
6. After that, type exit, to exit and remove the CD and restart computer