Keep in mind, without driver support you can't use your monitor's native resolution. You're stuck using a crappy low resolution, like 800x600 or 1024x768, which will look stretched out and blurry and overly large compared to the real resolution. It's never a good idea to use your OS in a lower-than-native res, because nothing will ever look accurate. Especially true if your monitor is widescreen but you're stuck using a non-widescreen res all the time.
You will need to get a real video card (if it's a desktop) or get a new system altogether (if it's a laptop or a desktop with no proper AGP/PCI-E slot). You can get a relatively inexpensive machine if all you're doing is basic tasks on a computer, and it'd support the basic needs, such as your graphics display, without any issue.
Note that the Intel GMA 915 wasn't even supported in Vista (2007) or 7 (2009), but those two OS had XPDM (no Aero, but could still use the resolution and XP-era graphics driver features). Windows 8 does not.
