The only official drivers for that model are Windows 7 64 bit, but both XP and 7 32 bit have some files. VAIO Update version 5.5.2.11040 for example, that looks like it will try to install the drivers for the system, but the only driver files for that model is for Win 7 64 bit.
If you want to try it, backup the existing system using a disk clone software, then try installing the new OS.
http://www.sony.co.in/support/product/VPCEG25EN