Someone may need to install Operating System Windows XP Service Pack 1,2 or 3 due to System crash or file corrupt. If you have windows 98 or 2000 then you can upgrade your Windows to Windows XP Service Pack 1, 2 or 3. But If you have Windows 7 or 8 then you are unable to install Windows XP. You must format your C Drive by using Windows 7 or 8 CD. You don't have permission to go lower version of windows from upgrade version. But you can go upgrade version from lower version easily. Windows XP Service pack 2 is so much user friendly. It will help you to do all task as fast and reliable. To protect from Virus you have to install antivirus of License copy. Otherwise you may face corrupt file or crash windows of your operating system. Microsoft Windows 7 help you to protect from Virus. Microsoft windows 8 is so much helpful and secure for doing multitask. Microsoft Windows 8 is compatible with 32 & 64 bit. For Installing Windows Operating System In your Computer You Need To Follow These Terms And Condition.