First thing you will need is a hex editor, you can find one at www.download.com if you don't have one. You will need to edit 3 files glide2x.dll, glide3x.dll and 3dfx32v2.dll.

For glide2x.dll and glide3x.dll: look for these hex bytes together 28 0F 85 12, change the 12 to 00 and thats it

For 3dfx32v2.dll(note for NT users: there is no 3dfx32v2.dll for NT): look for these hex bytes together 28 75 0E, change the 0E to 00 and thats all you need to do.

Make sure that these files are in your windows\system directory and you patched the same version drivers you want to use, I woludn't try to combine different versions

Credit for this goes to Andrei Osnovich, all I did was look at what he did and figured out how to apply it