I don't really have an answer here - although I know what is happening:
Now we are talking aspect ratios here
1152 x 864 = 1.333333333 = 4:3
whereas
1366 x 768 = 1.778645833 = 16:9
your Specs say:
Monitor(s) Displays Sony LED Monitor (2)
Screen Resolution 1600 x 1200
1600 x 1200 = 1.33333333 = 4:3
this explains why the
1152 x 864 = 1.333333333 = 4:3 looks unstretched and
1366 x 768 = 1.778645833 = 16:9 looks distorted
and of course to change from one resolution to the other you either need to squeeze or stretch the dimensions relative to each other.
But you also talk about your Laptop - what is the make and native screen resolution of that laptop? You don't give these figures.
Why aren't you able to run your graphics at 1600 x 1200 - or does that not apply to the laptop screen?
Do you need to identify your laptop screen to your system, so that it will be given the best resolution for that aspect ratio? Windows or the display driver often just says unknown non-PNP monitor - when the monitor is PNP.
You could download
unknown devices (beta 1.4.2.0) from
Halfdone: Unknown Devices to see if that can identify your monitor.
There are various tricks to altering the display without distorting the image, you can introduce black space at the edges, or overrun the sides or tops of the screen - like the older TVs had to do when displaying wide screen films. (Letterboxing, Pillarboxing, Windowboxing, zooming and cropping), but your graphics driver will not do these. Intel GMA drivers and control panels do not give all the features they indicate they can - like maintaining aspect ratio on all screens.
However, Laptops graphics drivers are often modified so that they do not cause problems on the hardware, however, they may still be poor drivers, and 3rd-party modified drivers can sometimes improve performance and stability. There may be better Intel HD 3000 drivers available. Latest driver for you I can find:
Intel HD Graphics Driver Windows 8 Release Preview download from Guru3D.com
I have 4 operating systems that I use on my netbook: Linux Mint 1024 x 600 - which just fits the screen - Windows XP where I can choose various sizes, some of which I have to scroll to get to the sides and top and bottom of the screen, and Windows 7 and Windows 8, both of which are limited to either 1024x600 or a distorted 1152x864 or 1024x768 - the laptop supplied drivers are for windows 7. If I had a choice, the XP drivers would be favourite.