I just found this info on the Husqvarna website. The driver has been moved to this location in the FAQ.
Carolyn Duncan
Sew What Designs
Is the 3D Embroidery System compatible with Windows Vista?
The 3D Embroidery System is not designed to operate on Windows Vista. This is also true for earlier embroidery software. The compatible operating systems are stated on the product boxes. Therefore, it is not guaranteed that the 3D Embroidery System, or previous software, will function correctly on Windows Vista.
However, it is possible to install 3D Embroidery System software on Windows Vista. To get your dongle working, after installing your 3D Embroidery System software, see FAQ #H013.
There are no other adjustments to the 3D Embroidery System in respect of Windows? Vista. The operation of the Designer SE, Designer I and Parallel Reader/Writer unit should not be affected, apart from driver installation. You may need to answer some security questions in Windows Vista while installing the hardware drivers, as the drivers were designed for previous operating systems.
A workaround is necessary when using the USB Reader/Writer and d-Card Reader/Writer. Each time you use either the USB Reader/Writer or d-Card Reader/Writer to read a card, write a card or send an embroidery with Send 1 or Send 2, you must disconnect and reconnect the unit before using it again to read, write or send.
Note that in due course, a new solution will be available for using the USB Reader/Writer and d-Card Reader/Writer with Windows Vista. If you do not qualify for free upgrades, there may be a handling fee for providing the CD containing the solution as it will not be part of the 3D Embroidery System.
FAQ#H013 Error “No dongle attached. Cannot open program” when starting my 3D software on Windows Vista, even though my dongle is inserted.
After you have installed the 3D Embroidery System software on a Windows Vista computer, download and save the 3D Embroidery Vista Dongle Update. After saving the file on your computer, double-click the file to install the dongle update.
Note: If the following User Account Control message appears when installing the update: “An unidentified program wants access to your computer”, click the ‘Allow’ option to continue.