Hi all!
Thought I'd reply and share my solution.
My pc-specs includes dual geforce 8500GT, a good-ol' CRT-screen as primary (Huyndai v995), and a Philips Flatscreen TV/monitor.. it got two vga inputs, and tuner-card of some sort, allowing rf-antenna, scart and s-vhs.
Anyhow, Windows 7 served me that freaking error message, which reads; "Unable to save display settings."
The only settings that worked, where Single display on one of them, and sometimes Clone. Think it was because of the two GPU's.
I've just rebooted my computer after a fresh install of the newest geforce drivers (181.22 32-bit), and it gave me NO hazzle !
Dualview is up'n running, although with SLI disabled, and bothe monitors to the same GPU..
I will be back shortly to reflect the results of testing with & withouth SLI, both GPUs and so on.
[shortly after: Oh yes! The new drivers actually do let me enable SLI AND Dualview! Such great minds... (Im happy!) ]