Hi PCG71911M and welcome.

Everything on the Sony website only uses the Vaio Model VPCEH3N6E folllowed by /W for white models and /B for black models.  You will find nothing using the PCG number.

This model was released with Windows 7 HP 64-bit and so most drivers are 64-bit only.

Did you try recovering your Vaio back to factory settings by pressing the ASSIST button when the Vaio is turned off fully?  Is there a particular reason why you want 32-bit?

To see all the available drivers: -

Click on Support (at the top of this screen)

Click on Online Support

Type your Vaio Model into the 'Get Started' box (VPCEH3N6E/B or VPCEH3N6E/W)

Select the 'Downloads' Tab and you will find the Windows 7 Drivers under both the Preinstalled Drivers and the Latest Downloads Tabs.

http://www.sony.co.uk/support/en/product/VPCEH3N6E_B/updates

Not all preinstalled software can be downloaded.