Need help,

My HDTV has PC input and can display 1024x768
When connected to my PC, I can really use the TV as a PC monitor although it not very clear and sharp as my pc monitor, but that is not the problem
The problem is the picture is stretched.
HDTV screen ratio is not 3x4 as my PC display
Does windows display driver can take display diver with different ratio than 4x3(800x600,1024x768 etc.)?
1024x786 is good for 4x3 but not 6x9
A circle looks circle my PC monitor but eclipse on my HDTV
My windows auto detect my HDTV as plug and play PC monitor
NO windows display driver come with my HDTV

Is there any display drivers for HDTV ratio?

Any help will be appreciated,