How do I repair Windows XP without re-installation

How do I repair Windows XP without re-installation 
Following phases according to the type of error.

Installation repair (Repair Install)
If Windows XP is damaged (corrupted) where you do not have to boot other operating systems,
You can do a repair installation (Repair Install) who works as the setting (setting) the beginning.

• Make sure you have the key (key) Windows XP are valid.
• The entire process will take less than 1/2 or 1 hour, depending on the spec of your computer.
• If you are prompted for an administrator password, you should choose the repair option (repair) the second,
• not the first.
•  Insert your Windows XP CD and boot from the CD.
• When it appears the second repair option R = Repair, press the R
• This will start the repair. 
• Press F8 to agree to the next process "I Agree at the Licensing Agreement"
• Press R when the directory where you installed Windows XP. Usually C: \ WINDOWS
• Next will be checked drive C: and start copying files.
• And automatically restart if necessary. Leave the CD in the drive.
• Next you will see a picture of "progress bar" that is part of the repair,
• he looks like a normal XP installation normally, including "Collecting Information, Dynamic Update,
• Preparing Installation, Installing Windows, finalizing Installation ".
• When asked, click the Next button
• When asked to enter a key, enter the key (key) your valid Windows XP.
• Normally you want to remain in the Domain or Workgroup name the same.
• The computer will restart.
• Then you will have the same screen as the activation of the system when the installation is normal.
• Register if you want (usually not required).
• Done

Now you can log in with your existing account. 

NTOSKRNL Damaged or Missing (Missing or Corrupt)
If you find an error message that "ntoskrnl not found" / ntoskrnl not found, do:

• Insert the Windows XP CD and boot from the CD.
• At R = Repair option appears first, press R.
• Press the number corresponding to the location of the Windows installation you want to repair.
• Usually # 1
• Change to the CD Drive you are.
• Write: CD i386
• Write: expand ntkrnlmp.ex_ C: \ Windows \ System32 \ ntoskrnl.exe
• If Windows XP is installed elsewhere, change according to location.
• Remove your CD and type EXIT 

HAL.DLL Damaged or Missing (Missing or Corrupt )If you get errors related to corrupted or missing hal.dll file , it is possibleBOOT.INI file has the wrong configuration ( misconfigured ) . 

• Insert the Windows XP CD and boot from the CD. 
• At R = Repair option appears first , press R. 
• Press the number corresponding to the location of the Windows installation you want to repair. 
• Usually # 1 
• Write : bootcfg / listDisplays the contents of / feedback on the current BOOT.INI file 
• Write : bootcfg / rebuildImprove the configuration of the BOOT.INI file 
• Remove your CD and type EXIT

Directory \ WINDOWS \ SYSTEM32 \ CONFIG damaged or missingIf you get an error with the inscription :" Windows could not start Because The following files is missing or corrupt\ WINDOWS \ SYSTEM32 \ CONFIG \ SYSTEM or \ WINDOWS \ SYSTEM32 \ CONFIG \ SOFTWARE " 

• Insert the Windows XP CD and boot from the CD. 
• At R = Repair option appears first , press R. 
• Press the number corresponding to the location of the Windows installation you want to repair. 
• Usually # 1- Enter the administrator password if necessary . 
• Write : cd \ windows \ system32 \ config- Next depending on the location of the damage : 
• Write : software.rusak OR ren ren software system system.rusak- Next again also depends on the location of the damage : 
• Write : copy \ windows \ repair \ system- Write : copy \ windows \ repair \ software 
• Remove your CD and type EXIT 

NTLDR or NTDETECT.COM not found ( NTLDR or NTDETECT.COM Not Found )If you find an error that NTLDR is not found during boot :

For the type of FAT partition 
Please you to boot from your Win98 floppy and copy the NTLDR or NTDETECT.COM filefrom the i386 directory to the drive stem / root ( root ) C : \ 

For the type of NTFS partition 

• Insert the Windows XP CD and boot from the CD. 
• At R = Repair option appears first , press R. 
• Press the number corresponding to the location of the Windows installation you want to repair. 
• Usually # 1- Enter the administrator password if necessary . 
• Enter the following command , where X : is the address of your CD ROM drive ( Sesuaikan! ) . 
• Write : COPY X : \ i386 \ NTLDR C \ : 
• Write : COPY X : \ i386 \ NTDETECT.COM C : \ 
• Remove your CD and type EXIT