The guide to Toshiba's HDD system recovery can be found here: cdgenp01.csd.toshiba.com/content/.../PMA500339010_web.pdf

Generally, it would be easier to conduct the recovery from the Hidden partition than the recovery discs (noneed to keep on changing discs XD )
In general, the steps involved are:

1. Make sure you backup all important files, EVERYTHING will be reformatted (except the Hidden Partition) when you recover your system. Noneed to worry about drivers and Toshiba programs as they are included in the Hidden Partition/Recovery discs.

2. Plug in A/C adapter and if possible, plug in the battery just in case of blackouts (in Malaysia) XD

3. Shut down your notebook.

4. Press and hold the "0" and the "power" button. A window will appear asking you whether you want to load a 32-bit or 64-bit windows. The remaining will be easy, just choose the "recover to out-of-box state" (Actually noneed to change anything, as for the subsequent windows, the initial ticked box will be the recommended one) XD

5. Partition reformatting will commence. Initiate the next step.

6. After that, leave everything to your notebook, it will restart on its own for quite a few times (to install the drivers and programs), may take up to 1-2 hours depending on your system. You will be configuring your OS in no time.

I guess that's all, hopefully this will help those who wanted to switched to 64-bit OS i.e. Eguy1314 ^_______^

** Be warned, Toshiba's feather touch buttons may become unresponsive after switching, still looking for answers for that one, it seemed there are no drivers for these buttons zzzzzzzzzzzzzzzzzzzzzzzz

Anyway, Do refer to the link above for more elaborated details 
Best of luck!

thanks to lee_what and astria who help me