I'm not entirely sure what you mean. I was going to use the drivers that matched my onboard graphics
Service & Support
Go there Click "Driver Download" on the left then choose "Desktop" --> Aspire --> Aspire T320 --> VGA Driver
That is the one that is manufactured for my system. If you're talking about not using the correct video adapter on bootup I was going to switch from "PCI enabled video" to "Onboard video" in my BIOS everytime I wanted to play the game then just reboot and switch back when I wanted to use my GeForce instead.
That might not be possible but I'm not sure as I've done it before with two completely different video cards on one computer (one was an ATI Radeon HD4890 PCI-E2.0 the other was an Nvidia GeForce 9400GT AGP) the only difference with that situation was I used a windows 98 boot disk to fdisk a new partition but my floppy that had the boot disk on it no longer reads in my floppy drive.
So again, I'm not sure where you got the idea that I would be using the wrong driver.
I found a way to do it without the need of dual boot. I just rebooted, changed the graphics adapter to onboard via BIOS, saved turned off my system, plugged my monitor into the onboard VGA slot, rebooted, disabled my GeForce card in Device Manager, installed the Intel graphics driver, rebooted, and viola I'm now typing this through my Intel graphics and I didn't even need a dual boot.