An error I don't know how to fix.

I am unable to run an add on called Nehahra for the computer game Quake. When I run Nehahra.exe I get the following error message:

Quake Error
GL_Upload8_Ext: too big

I have a PowerSpec computer with:
Pentium 3 processor at 550MHz
Intel 810 chipset graphics driver (the most recent one)
DirectX 8.1

Benzo need help!