Hi all
 I have a problem .When I open my PC,I SEE the screen first
"start window Normally , Safe Mode ,Last Know good configuration  and so on.And  then I choose start window Normally then window logo appear about 5 sec and come again the previous screen.I choice again safe mode but it is not ok.I try to REPAIR my window but I cannot change First Boot Drive to Cd drive because I cannot see the bios and cannot enter.
what should I do any more.
I use window Xp Sp2.
256 DDR 400
Intel  Celeron Processor
any advice would be appreciated.

Best regards,
 GreenYou will have to open the  computer, power off,  and unplug both cables from you Hard Disk Drive. Power must be off. Turn on power, you should get a message that lets you get into the BIOS. Make the changes needed. Save, Exit. Power off. put the power and data cables BACK on he drive, close the case. Now power up with the CD in place. Start tapping the space bar until the CD boots. thanks for your advice.
I do as your instruction then I see this screen with this message
" Reboot and select proper Boot Device or Insert Boot Media in Selected Boot Device and press a key..."

I don't see Bios information .

Pls advise me some another instruction.
When your computer is first turned on, before windows starts, you should see a message that says to press a certain key to enter SETUP. It is usually an Fkey or esc or del. Pay attention, as the message may flash very quickly.

Once you get into setup, you want to look for BOOT ORDER or BOOT SEQUENCE or maybe even just BOOT. Set you CD drive as the first boot device and then place the CD in the master CD drive.

Now exit setup and SAVE changes.
When it starts back up, you may see a message that says: Press any key to boot to CD. Just keep tapping the space bar as the computer starts up.Thanks you.Now I see Bios By press F2 and then change first boot drive to Cd drive.
 
I have repaired my window.Way to go

if you are going to try to repair your XP look at this
http://www.michaelstevenstech.com/XPrepairinstall.htm