N240GT MD1G - Resetting resolution

I need help...
I've gotten myself a new graphics card, a MSI N240GT-MD1G to be precise. Not a heavy thing by a long shot, but way better than my integrated piece of that doesn't even have OpenGL support.
Anyways, I'm having some problems getting the resolution to work properly...
I'm used to running my desktop at 1280*1024 (the max my monitor can handle), but for some reason this graphics card doesn't like anything but 640*480. I've installed several drivers now (it's supposed to use the nvidia ION drivers), and when using a clean install things work great... UNTIL I do anything that requires either a reboot or running in fullscreen.
If I do run a fullscreen application I'm reverting back to 640*480, and it stay that way until I clear the driver and reinstall from skratch. Same if I reboot; When I boot back up I'm at the ugly ol' 640*480.
Can easily be fixed by reinstalling again, but it's a bloody hazzle.
I've also started in Safe Mode where I have removed all old drivers, rebooted back into Safe Mode andreinstalled drivers, but with no more luck. I've also tried various versions of drivers with no noticable differences.
If I enter the nVidia Control panel I get a popup saying it recommends 1280*1024 and whether I want to activate that. If I say YES I get the 15 sec countdown asking if I want to keep the "new" resolution, even if it's still 640*480.
Here's a little DxDiag info:
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_gdr.100427-1636)
Language: English (Regional Setting: Norwegian (Bokmål))
System Manufacturer: Dell Inc.
System Model: Dell DM051
BIOS: Phoenix ROM BIOS PLUS Version 1.10 A05
Processor: Intel(R) Pentium(R) D CPU 2.80GHz (2 CPUs)
Memory: 2046MB RAM
Page File: 775MB used, 3162MB available
Here's the link to my PC model
What can I do?!??

1) Go into device manager and uninstall the entry for the monitor/s. Reboot and let Windows install the driver or install the manufacturer's driver from their website.
If still no luck:
2) Type regedit into the run box under the start menu, click the edit --> find and type DefaultSettings.XResolution. Double click the entry called 'DefaultSettings.XResolution' and change the value to 500. Find the entry for DefaultSettings.YResolution and change the value to 400. Reboot your system and see if that sorts it.
If you're worried about editing the registry, make a backup first.

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Force Quadra av machines to use TV as a monitor........ CMD-OPT-T-V
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Radius (Use cable sense pins to set resolution)........ U
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Launch CC at Startup................................. SPACE or CAPS LOCK
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Apple System Installer:
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N240GT MD1G - Resetting resolution

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