Dual Monitors, settings lost on reboot?

I'm using two AOC monitors (Windows XP Pro) and have installed the drivers that came on the AOC disk.

However, monitor 1 is losing its settings on reboot, and the taskbar has moved over to monitor 2. Everything can be reset but the same problem occurs on reboot.

AVG 6 was reporting a BackDoor.Delf.AW trojan horse. After upgrading to AVG 7 this is no longer reported.

Any help would be much appreciated.

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