Hello ,My 120 hdd has been failed since 2 days . can we use another 500 gb hdd external hard disk to boot . to get back laptop back . withj genuine win xp pro .
How about downloading a Rescue Kit 11 Free edition, making a boot CD and then boot from CD.
Have a look here: http://www.paragon-software.com/home/rk-express/
You might be able to repair your 120GB internal HDD - Good luck!!