Help? :(

Hi Guys.

I recently purchased a Dell Inspiron 1545 from Carphone Warehouse, it's a 1.00 GB RAM installed with Windows vista (Which I've been told by someone at Dell isn't enough for vista!) and it's a 15" monitor. The problem I'm having is that the images seem to be choppy/grainy/pixelated, if that makes any sort of sense. The images are quite poor quality. I'll try to explain it as best I can.

Basically, mostly on Pixelated images and gradients, but also on certain text, the image can appear to have rough/pixelated edges, rather than smooth. So for instance if I have a diagonal line in pixels, rather than it appearing to be smooth I'll be able to see every dot making up the image. I've tried to draw an example below:

http://iaza.com/work/090926C/Pixels98435.png

This is what I'll be able to see except in a fully zoomed out version. I've tried changing the Resolution to 1280 x 768 from 1366 x 768; (My native resolution) but this just makes everything a blur and makes the screen seem stretched, all though it fixes the pixel problem.

I did have this problem on my other Laptop, but I just changed the resolution and installed 1 driver and it worked fine after that. It was an Acer 5720z. On here as I said when I change the resolution it makes it very blurry/stretched, and no drivers seem to be fixing it. Am I the only person having this problem? And is there a fix?

I hope I've explained this right. It's quite frustrating because I do work with Pixels alot day to day.