I have 1 note book LG X120 with windows 7. when im trying to install Windows XP proffessional through a USB CD ROM its showing the following Message * To specify additional SCSI adapters, CD-ROM drives, or special disk controllers for use with windows xp, including those for which you have a device support disk from a mass storage device manufacturer, press s * if you do not have device support disks from a mass storage device manufacturer, or do not want to specify additional mass storage devices for use with windows xp press enter what should i do? please tell me how to proceed

To resolve this issue:

1. If you are upgrading Windows 98 or Windows Millennium Edition, follow the troubleshooting steps that are described in the following Microsoft Knowledge Base article: 310064 (http://support.microsoft.com/kb/310064/ ) HOW TO: Troubleshoot Windows XP Problems During Installation When You Upgrade from Windows 98 or Windows Me Test to determine if the issue is resolved. If the issue is resolved, do not complete the remaining steps. If the issue is not resolved, go to the next step.
2. Perform a clean installation of Windows XP:
   1. Insert the Windows XP CD-ROM into your CD-ROM or DVD-ROM drive.
   2. If Windows automatically detects the CD-ROM, click Install Windows to start the Windows XP Setup Wizard. If Windows does not automatically detect the CD-ROM, click Start, click Run, type CD-ROM drive letter:\setup.exe, and then click OK.
   3. Press ENTER.
   4. Click New Installation, and then click Next.
   5. Follow the instructions on your screen.
3. When you receive the "Press F6 to load SCSI/Raid Drivers" prompt, press F7 to bypass Advanced Configuration and PowerInterface (ACPI) detection.
4. Finish the installation of Windows XP.

what if you don’t have DVD-ROM and you are running Windows XP, you might have guessed in this case we can’t install windows 7. Since Windows 7 ISO size is around 2.24 GB so its obvious that you will need to burn windows 7 iso on DVD and another issue is you can’t start windows 7 installation by mounting ISO file on windows XP as Windows XP upgrade to windows 7 is not allowed. In such situation installing windows 7 from USB pen drive is feasible solution.
Here is small guide on how to install windows 7 from USB flash drive or USB pen Drive for Windows XP users.
How to Install Windows 7 from USB Flash Drive Requirement:
USB Pen Drive (Min 4 GB)
Windows 7 ISO (32 bit or 64 bit)

MBRwiz Download and Extract it on your hard drive (Diskpart utility for Windows XP doesn’t detect USB drive as Disk hence we need to use this free utility to make bootable USB drive).
1. Connect your USB Flash Drive to your computer Format USB drive
2. To Format USB Flash Drive Go to My Computer -> Right click on USB drive and select Format from context menu.
3. Now go to Start Menu->run->cmd (Open Command Prompt) and Type following command
convert i: /fs:ntfs (Where “I” is your USB drive latter)

4. Mount Windows 7 iso as drive (You can use Freeware MagicDisc download from here).
5. Type Start->run->cmd
Now dir to directory where you have extracted MBRWiz and run following commands

mbrwiz /list (note down disk number of your USB Pen drive)
mbrwiz /disk=X /active=X (X is Disk Number of your USB Drive)
exit
6. Now open another command window and type following command
J: (Drive letter of Windows 7 iso mounted with demon tool)
CD boot
bootsect /nt60 Y: (Y is drive latter of your USB drive )

7. Now copy all files from drive where you have mount Windows 7 iso
8. Now reboot your computer and press F9 to get your BIOS screen and select USB drive as your boot drive.
9. If every thing goes fine, Your Windows 7 Installation should start from your USB drive.