It's 2011, and ... you don't care. All you want to know is how not to be stuck at 640x480 and 16 colors on Windows 98 guest on VirtualBox and guest additions won't ever be made on Windows 98 or 95.

Hey- I've installed Windows 98 using VirtualBox within a fresh install of Ubuntu 10.04. Computer: DELL Inspiron B120. Anyway, my problem lies in my difficulty in installing graphics drivers to the Win 98 installation. Just wondering are there any ways to change the screen resolution of Windows 98 in VirtualBox in 1366x768. I already know I can use SciTech Display Doctor to set the resolution to 4:3 and full color, but I want a 16:9 resolution instead of a 4:3 one.

Here is a video tutorial on how to get 256 colors in Windows 95, 98 and ME!Check out MS-GIL's video here for the file!https://www.youtube.com/watch?v=dOCyxMD. File Name: display-driver-windows-98-virtualbox.exe Version: 2.3.5 Driver Date: 25 July 2018 File Size: 15,181 KB.

How easy is it? go to http://bearwindows.zcm.com.au/vbe9x.htm and download, for instance, 2010.06.01 (click one of the ? on the right).
Now you have a .zip. Extract it.
Make a .iso from that folder with your favorite program.
You now can mount that on your Windows 98 image.
Update the driver from Device manager and point it to the VBE9XUNI folder and let it install. Reboot and you have color!

Windows 95 Virtualbox Graphics Driver

YRMV, don't blame me if it doesn't work, etc. All I can say is it worked well for me.

Virtualbox Windows 98 Drivers

I suppose you're also looking for AMD PCnet drivers at the same time. Stop. Don't panic yourself about it, but stop the vm, go to network, advanced, and change the nic to the one above it -- NOT the FAST one. (have your Windows 98 CD available, and ... it is installed.)
2015: updated to a different domain.