System :: I can't install video driver.

Which one are you talking about now?

I suppose you're probably asking about the one included in the XF86 package, since you didn't answer the other questions.

1. Install it according to the .info
2. When you are choosing your XF86Config-4 , you can either download a premade template for via from the web, or use the sample one for vesa and just change the line from Driver "vesa" to Driver "via"
3. Restart X server.

I've been trying it but the vesa template modified doesn't work and i can't set up the resolution with the template i've downloaded from internet.

i don't know how to do...

Describe what you changed, and what errors you get.

If you can't get this running, why are you trying to change resolutions already?

With that aside, you could try xf86config.dsl, although it's pretty limited.

original here.