Since the process varies slightly for each manufacturer, you are most likely to find instructions in a README file included with the driver. If not, here are some general tips, based on personal experience with several Win 3.x video drivers. Assuming the drivers were installed properly, do (at least) one of the following to select the new driver:1. Open Windows Setup from the Main group in Program Manager. Select Options - Change System Settings and select the display driver from the dropdown menu. In your case it will likely say S3 ViRGE something. Allow it to restart Windows if it asks. Some cheaper video drivers (e.g. early Trident cards) will add further options here in Windows Setup to change resolution and colors after you reboot. If it's a Windows 3.0 video driver, it might not even do that. The better 3.1x drivers additionally (or alternatively) require step 2 below:
2. Open Control Panel from the Main group in Program Manager. You should see a new icon added here, often named Display or something similar (again, YMMV.) From here, you will have several options you can change, including color depth, resolution, and possibly refresh rate and other things. You should be able to get the 800x600, 24-bit color mode here with your 2MB card. If your video card is decent, you might even be able to get an 85 Hz refresh rate, but some 2MB cards only allow 60 in this mode.
3. If all else fails, your video driver may have added a special group to Program Manager. Some ATI drivers tend to do this, adding features such as scrollable desktop sizes larger than the actual resolution.
N.B. Windows 3.11 does not have a "safe mode" like 9x/NT5+ or a "VGA mode" like NT 3+. So if you inadvertently select a video mode that your card or monitor cannot handle, you'll need to run Windows Setup from within DOS to select VGA and start over.