Aspect ratio reversed

Hi all,

I have a client with a Dell Vostro 1500. Her display occasionally reverses and shrinks aspect ratio: from 1024x768 to 600x800 (that's right - not 800x600). It does this by itself on boot-up but only occasionally. I thought it must be malware so I scanned with AV, Combofix and Malwarebyte's Anti-malware and found nothing. The only way I've been able to get it back to normal is to uninstall the Intel GM 965 Express adapter in Device Manager and restart. It then goes to 800x600 and I can set it to what she wants. I have downloaded the latest updates only to find that the latest is already installed.
Has anyone experienced this and know of a way to make the fix permanent?
 
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