Sont VAIO wireless adapter not found

I have a Sony VAIO PCG-7164M laptop. I have had to re-install windows as the system crashed and trashed the system.

I have installed Vista bought from Microsoft, but the wireless adapter is not present in the hardware setup, the light on the switch is off - wherever the switch is.

I need to install the drivers and get it working.

I have been trying various drivers/approaches, but I am getting no-where fast.

I cannot find the original disks that we got with the laptop.

Windows.old exists where I presume older drivers are still available - but have no idea where to look.

Any help gratefully appreciated.