Laptop computer screen posterization

I am shooting RAW and opening in Photoshop CS3 with AdobeRGB profile. My desktop NEC LCD screen displays the images correctly. I recently purchased a HP Pavilion dv9910us laptop, and it exhibits some posterization, even at the best screen angle. I'm wondering if this is a problem I will be able to solve or if it is a limitation of the hardware.
17 in. WXGA screen
nVidia GeForce 7150M (shares memory)
3 GB RAM
AMD Turion 64 X2 TL-60
Vista 32 bit SP1
Color is set to 32 bit, Powerplan to High performance. The monitor has no specific profile. It is set to generic PNP. My older SpyderPro doesn't work with Visa, so I can't create a profile for the monitor (unless I upgrade to Spyder3.
I specifically chose a laptop that had a graphics subsystem, so this posterization is disappointing to me. Any thoughts?

Is it a spyderPro driver/hardware incompatibility issue? or is it the software that came with that won't work?
You can try a different profiling software package...maybe even a demo could suit your needs in the short term.
An extreme solution is to get a very cheap hard drive - install win 2000 or XP and create a profile in that and then save that profile for use with Vista when the vista drive is put back in.
But for the cost in hardware and time, it's probably easier to get a new calibrator which will ensure easier future profiling.
EDIT: Is your NEC a wide gamut monitor? - maybe the posterizing is caused by using an aRGB image on a sRGB screen.

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