Great news for users of the VGN-UX90S! You can now download the original recovery disk from the Internet Archive! This disk allows you to restore your UMPC to the original Sony software, as if it were brand new, and includes all drivers and utilities for this type of computer.
Many thanks to user SonyGallery for sharing the disk after getting in contact with me about the VGN-UX90S!
You can download the recovery disk here:
Sony VAIO VGN-UX90S recovery disk
1 file(s) 4.0 GB