Hi. Sorry to bother you guys but I have the same problem. A few days ago I bought a Creative Gforce FX 5600 Ultra and I keep getting that annoying message from nvidia sentinel almost everytime I'm in a 3d game or something.
I've changed my power source ... I bought a very expensive Chieftec source True 420W and, unfortunately, it didn't solve my problem.
I've unpluged all the things from my computer (Cdroms, Hdd, Live Drive, etc) and although I've remained only with one HDD and the FX plugged I keep getting that message. Don't know what to do

I have an ASUS P4PE motherboard, P4 3,066Mhz CPU. I've plugged the additional power supply to the FX card, of course.

Pretty pretty please help me.