Resolution within a Resolution??? adjusting overscan? - 27" TV Please Help!!!

[Excretious]

Is there any way i can adjust the picture size on my 27" toshiba?  The sides of the windows desktop are clipped a good quarter inch and i was hoping i could somehow adjust the overscan and move the overall image inwards.  

This is important to me because when i drop this tv into my cabinet, i would like to shrink the size if the 27" screen is too much  "in your face".  The tv will be 34" from your face so being able to shrink it down would be awesome if need be.

I tried using tv tool but couldnt figure it out and am hoping that i can simply accomplish this somehow within the nvidia software......

2.6 dell celeron
27" Toshiba
xfx nvidia 64mb geforce2 mx400 svideo out connection


Thanks in advance for any help!!!