Acronis True Image 11 Home
This time the issue was that my father's pc was running terribly slow. It's a Toshiba dynabook A8/420CME: Celeron 2GHz, 768MB RAM. To run Windows XP, it's not that bad spec. But it's a 2003 model so that hard disk drives was old enough to get sucked.
After some googling, I've found a hard disk drive cloning software: Acronis True Image 11 Home. It allows to create a bootable CD and clone an internal disk to an external USB disk. Fortunatelly, I just bought a 2.5 inch hard disk drive enclosure so that I made the bootable cdrom, connected a new 2.5 hdd and started cloning disk at midnight. Next morning, only thing I had to do was replacing the cloned disk to the internal disk. Viora!!
I know there're couple of ways to do the same thing without paying any money. But it's a too much hustle while my whole family is having peaceful new year holidays. So, next time when you visit your dad and mom house, don't forget to bring a USB disk enclosure and this useful CD.
Acronis True Image 11 Home