The thread was intact. Page 7. A user named audio_ninja had posted a driver package with a filename that looked like a serial killer's license plate: R2.73_VAIO_MOD_W7_x64.7z . The download link was to a now-defunct file host. But someone else had mirrored it on Dropbox. And that Dropbox link—against all probability, against the entropy of the digital age—still worked.
Visit us.vaio.com (Vaio Corporation). While they focus on new models, they maintain an archive of legacy drivers for older models. Search for “VPCEH” series. Sony Vaio Vpceh25en Drivers For Windows 7 64 Bit