I have it working on both my laptop (2-core running windows Vista-32) and on my office system (4-core windows vista-64), however, the tricky one was the office system.

I researched PSDSoft issues with ST and found out that the software is only intended to run on upto 32-bit operating systems. That said, when I installed Windows Vista-64 on my new office system, I was screwed. I ended up running a virtual machine (vmware) on the office system, and loaded Windows-XP Professional 32-bit operating in that system.

PSDSoft loaded fine there, and I am able to assign a USB port to that virtual machine, so Keil will communicate with the ULINK as well...

The one thing I haven't tried is the ST utility for manually programming the device. I use the IDE from Keil to talk to my upsd3334D, and all seems fine here...

Hope this helps,

-db