I need to access BIOS at start.

http://techgage.com/article/creating-bootable-windows-xp-7-8-flash-drive-installers/

Somehow your MBR (Master Boot Record) likely got corrupted or possibly your hard drive went bad coincidentally.

Simply, you will start your computer from your Windows CD/DVD install disk, then when at a DOS prompt ( D:\ ) you will then type: FDISK /MBR (press enter).

Find your Operating System install DVD and start your computer with it, then follow instructions within this discussion:
Restore Windows XP MBR without Windows XP disc

Alternatively, review my search results for other instructions:
fdisk mbr windows xp Google Search

Windows won't start up? Well, try this Download Tenorshare Data Recovery from its offical site and install it. Burn it into CD/DVD, or USB flash, put into the computer you need to repair, Bios setting. It can make sure your important data will not lose. Best of luck
Related: windows won't start

Turn Off the computer now as soon as you hit the power button, keep on holding Alt key & keep on tapping F10 key ie: Alt+F10, it will open the recovery console select full factory restore and follow on screen instruction. (Note:this will erase all datas on the computer) or

During the boot process you will see on the screen to press a certain key to enter setup usually delete or the F2 key this will differ depending on which bios you have

Press and hold that key during the boot up process to enter BIOS using the arrow keys you can load failsafe defaults or load optimized defaults press escape then press f10 to save to cmos to restart
hope it helps

---------------> Perform a clean install of Windows XP 1)- Start your computer from the Windows XP CD. To do this, insert the Windows XP CD into your CD drive or DVD drive, and then restart your computer.
2)- When you see the "Press any key to boot from CD" message, press any key to start the computer from the Windows XP CD.
3)- At the Welcome to Setup screen, press ENTER to start Windows XP Setup.
4)- Read the Microsoft Software License Terms, and then press F8.
5)- Follow the instructions on the screen to select and format a partition where you want to install Windows XP.
6)- Follow the instructions on the screen to complete the Windows XP Setup.

Note:- Back up all important information before you perform a clean installation of Windows XP. Save the backup to an external location, such as a CD or external hard disk.

Need more information. How did you lock it? In the BIOS?

Assuming you did this in the BIOS you will need to enter the BIOS by hitting F1, F2 or DEL while the computer is booting in BIOS. Sometimes you will see the BIOS key noted on the bottom of the Boot screen. On the first BIOS screen check to see if your HD is listed. If so go to the BOOT screen. On the BOOT screen check the boot order. To move the HD to the top click on the HD and click on the "+" key to move it up of select it if you get an options window. In the BOOT SETTINGS screen click on the HD to varify that the correct HD is listed. If more than one HD you can move the boot drive up by using the "+" key or options window. Check your other settings. When done hit ESC and go to the last screen and select to SAVE and Reboot.

If you locked yourself out at the Windows Password screen. If you are using Windows XP Home, reboot and hit F8, F10 or F12 during BIOS boot. Select SAFE MODE. When Windows open go to the Control Panel - Users and delete the users. This will remove the passwords. Close windows and reboot computer. Windows will now start and open without passwords. If you are using XP Pro you will need to take the computer to a Tech who will have a Password Disc to clear the passwords.

you are to slow, you must hack constantly in beginning on F8 to get in in safe mode. also try to get in BIOS with DEL button or F10, F2 depends what kind of computer your have. if that doesn't work, it seems like keyboards not supporting bios.

Before trying to use any of Dell-net's suggestions, we've got to get you into the bios.

It looks generally like this:



You should see a message displayed when you start the computer that says press "Del or F2 or F10" to enter setup.

Once we get here, we can proceed.

boot into safe mode on xp. when you start the computer and the bios screen comes up start tapping the F8 key. it should take you to the boot selection screen. press your arrow keys to get to the selection "Windows Safe Mode" and press enter. when xp loads the login screen, there should be an admin account now. use that account to set users access to admin rights.
if you dont want that user to have admin rights but still start software that requires admin rights, try this. right-click on the program. go to run as... and choose administrator.

please let me know if this helped you :)

try reinstalling your camera driver