Maybe not enough RAM
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Maybe not enough RAM
This maybe a wild idea, but what if you go to the desktop, right click and go down to personalize and change the theme OR the colour and appearance briefly, to see if there are any changes? It could be weird error that's happened with your Dell PC where the settings haven't fully adjusted.
Dead pixels? :D
Reinstall Vista, THEN go to Dell Tech Support... Dell Tech Support should always be a last resource, and have some stress balls ready :P
If I did a system backup then reinstalled Vista then copied it back from the backup could that fix the problem? I realy cant be bothered to install all my programs again
Go for it.
It may seem stressful but its either a nice fixed vista or a bad image vista... My dell was (thaknfully) ok and has had no problems :)
Its a Graphics Card problem,
Try and get the latest drivers for your graphics card