so how do i use it?

bad example, try this:
http://www.download.com/3001-2347_4-8755576.html
be careful what you set the resolution to though.

this doesnt seem to work either. when i try to set the resolution higher a error pops up: "failed to change the screen mode"

In that case, have you tried contacting Sony or Compaq (vie email) to see if they can help/recommend drivers?

ii dont know if this makes a difference but i click on adaptor it says:


Adapter Type

Intel(R) 82845G Graphics Controller

When you went to Sony Support did you load the driver for the Intel(R) 82845G Graphics Controller?

What is your exact Vaio model?