I haven't played CS original for quite some time now, but I still play the old Day of Defeat, Team Fortress Classic, etc. so I know the issues pretty well.
Going from memory, I do remember a lot of people bitching and complaining about VooDoo Video cards way back and being overall pretty crappy.
You can still probably find some PCI video cards in some stores today that are either G-Force or ATI and should work just fine to replace your VooDoo..... I just helped a friend buy one about two months ago for his computer (Make sure you do not buy PCIe but
PCI)
That would be the easiest bet.
However until then, what do you do?
Well for starters, the main problem usually lies with the video card. Since you're is a VooDoo, let's focus on what we can do with that card to make things work.
Go into your Options and into your Video. Depending on if you're using the old WON or the new Steam game, you should have 2-3 video options.... Software, Direct3D and OpenGL. With my old computer I used to play online with, it was bare bones and less then, yet I still got online and kicked a lot of ass, even though my resolution was set to 320x240 @ Software with a 33.3k modem. (Very bad looking, but got the job done)
For your card, I believe in the past said you had to adjust from either Direct3D to OpenGL, or vice versa. Whatever you currently have it set to clearly isn't working, so switch to the other and apply the new settings.
With the VooDoo, it can only handle one or the other. If you have Software available, give that a shot.... it may not be pretty and may not be smooth, but it should work no matter what card you have. Since Valve updated the game to Steam however, I think the Software option no longer exists.
In my example way back with my old system, I had a 10MB ATI AGP Video card.... pretty cheap and pretty crappy (Although it was good at the time) My ATI card couldn't handle Direct3D, and everytime I set D3D on and loaded up the game, it'd either crash or the refresh just flat out sucked that you couldn't even play. My card could only support OpenGL or Software.
So with my experience you may have a similar problem..... whatever you currently have it at now, switch it to the other available setup, hit apply, and to be safe, shut the game down and restart to make sure it loads up properly.
For further information, check this out:
ftp://ftp.tomsknet.ru/pub/games/halflife/hl/README.TXT
IV. 3D HARDWARE ISSUSES
Half-Life has the ability to use both OpenGL and Direct3D. Many cards with support for 3D acceleration will provide both OpenGL and Direct3D drivers. Which one is better depends upon the quality and performance of the drivers themselves, and will vary from card to card.
The latest release of DirectX, version 6.0, is included on the Half-Life CD. It should be automatically installed as part of the Half-Life installation process. If you need to reinstall at a later time, open the DirectX folder on your Half-Life installation CD and run dxsetup.exe.
In general, make sure you have the latest versions of the device drivers for your display hardware. Most graphics card vendors make them freely available on the Internet, and a collection of links to sites of many popular cards is installed on your hard drive along with Half-Life. The default location for this file is:
C:\SIERRA\Half-Life\media\DrvPage\default.htm
Video configuration is set in the Configuration\Video\Video modes menu in Half-Life.
The following section explains the known driver and compatibility issues for specific chipsets at the time of Half-Life's shipping. If you have any questions about which chipset is incorporated in your graphics card, consult the documentation that accompanied your card, or contact the card manufacturer.
3DFX Banshee, Voodoo 1, Voodoo 2, Voodoo 2 SLI
Get the latest drivers from your card manufacturer or get the latest drivers directly from the 3DFX site. Half-Life ships with the current, tested GL mini-driver. Make sure that you have Glide version 2.54 or above. Half-Life does not support Direct3D on Voodoo cards.
The Voodoo 2 running in SLI mode on Windows/NT is prone to crashing. The solution to this instability is to either get an updated driver from 3DFX, disable SLI mode, or run under Windows 95/98.
There's more in that link, but this was what focused on VooDoo cards.... which sounds to me as though you need to do what I needed to do.... avoid Direct3D and use OpenGL. They look pretty much the same.
Hope this helps.