Hi tasang and welcome.

There are more than forty Vaio W models, so the full model number would have been usefull.

However, I think Recovery is the same for most of these models.

Recovery software is held in a hidden recovery partition on your hard drive and you can restore the Vaio back to factory settings by tapping F10 during boot.  If the Edit Boot Options screen appears, press Enter to launch the Vaio Recovery Centre.

If you have an "ASSIST" button on a newer W Series Vaio, press ASSIST with the Vaio fully turned off to enter the Vaio Recovery Centre.

There is a Greek version of the Recovery Guide - you can download from here: -

ftp://ftp.vaio-link.com/pub/manuals/RecoTS/2010Q1_TRG_HE.pdf

Or if you prefer the English version from here: -

ftp://ftp.vaio-link.com/pub/manuals/RecoTS/2010Q1_TRG_EN.pdf

Look at Page 9 for instructions.

This will only work id the Recovery Partition is healthy and has not been destroyed.

These are the correct manuals for your model: -

ftp://ftp.vaio-link.com/pub/manuals/RecoTS/2009Q3_TRG_EN.pdf

ftp://ftp.vaio-link.com/pub/manuals/RecoTS/2009Q3_TRG_HE.pdf

Follow the instructions on Page 9.

Hi Tasang. Make sure all your files are backed up beofre doing this. It will delete everything and install from scratch.