====How to install windows XP====
  - Insert CD of windows XP in cd drive in computer and restart the computer.
  - 'Press any key to boot from cd' such message appear on screen.
  - Wait till the partition window appear on screen.
  - For deleting previous partition , click on that partition,first click "D" then "L" to confirm that deletion.  
  - After deleting all partition,create New partition by clicking "C" key from keyboard,create partition according to your needs.
  - After Creating new partitions,click enter to install that partition.
  - For formating previous partition,choose option "format using NTFS file system",then automatic process goes on until computer is restarted and new window appear on screen ----> Automatic process goes on ----> ask for your name ----> enter any name ----> click "next" ----> computer restart and window XP start normally.
  -Install necessary drivers (Like LAN driver and Graphics driver) of windows XP from CD specific for that CPU processor.