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The video chipset for that model seems to be the Intel 82852/82855 GM/GME Graphics Controllers Driver, which you can get from the Intel website. Windows 7 should also have a built in driver for that as well, since that chipset is very common.
try going to HP web site, you can download the specific driver for your VGA graphics card, if yours is the CTO notebook it's the intel 82852/82855 GM/GME Graphics controllers driver. If not, go direct to the HP drivers page and you can select the exact model VIA there. Also had other software drivers if you are having problems with other hardware.
What program are you using for the dual setup? Place a shortcut in startup. usually an external monitor is used in place of the laptop LCD. The Monitor may need to be #1 and the laptop LCD#2
This site may help too.