|"i am unable to access cmos and bios."|
Why are you unable to get into BIOS?
Usually during boot there is something displayed on screen that tells you which key to press to enter setup. Sometimes it is DEL others are F1, F2, F10 or 11
If there is a splashscreen covering up the initial boot sequence you can close the splashscreen by hitting ESC. That will let you see the boot sequence.
Once you get there you need to alter the boot sequence to say CDROM first. Insert your XP Install disk, save changes in bios and re-start the system by hitting CTRL/ALT/DEL
Then follow this tutorial:
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