Resolution Problems

Hello there...

I am using SIS 64-Bit PCI VGA Card which is same as SiS 6215 Graphic Adapter.

I had been working with 600x480 resolution and now decided to switch to 800x600. But now that I have switched, my screen stuff appears to be a little oblong! there is a curve at all ends.. specially the vertical ends of the screen... I am using LG's Studio Works 440Si monitor...

Is there anyway to cure my probelm??

woudl appreciate help...

thx

Falcon