Welcome to Club Vaio Dushkenl!
I was not able to to find your model in the oficial model base in our website, but I found the same model in internet by google, specially for spanish market.
If the downgrade is supported by SONY, you just need to download the XP directly from the website.
If NOT, I would like to say that after your dowgrade, several hotkeys and peripherical's will not work anymore and you will need to find the drivers... it's a headache...
The internet is plenty of downgrade option...
The chipset from your model is : Mobile Intel(R) 4 Series Express Chipset Family
I found a specificy downgrade tutorial for your model, but in spanish, here...
My recommendation... Why not upgrade to Windows 7 ? :smileygrin:
