Share your experience!
Hi SamerDubai and welcome to the forum.
Unfortunately installing a retail version of XP on a Vaio is fraught with problems but not impossible.
The drivers and utilities need to be installed in the correct order for the system to work correctly.
These links may be of help:
Sony Support (US) (ignore references to US sites and download any drivers/utilities from Vaio-Link)
Club James
Did you read the ClubJAMES article?
Do you have anything showing up in Device Manager as an Unknown device?