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Open Display in Control Panel.
On the Settings tab, under Screen resolution, drag the slider, and then click Apply.
When prompted to apply the settings, click OK. Your screen will turn black for a moment.
Once your screen resolution changes, you have 15 seconds to confirm the change. Click Yes to confirm the change; click No or do nothing to revert to your previous setting.
If you cannot set it any higher than 1024x768 and you have already installed the video drivers, that is as high as it can go for your hardware.
Download the correct XP drivers for the System from Toshiba's website itself. Install all the Toshiba drivers as on some of the notebooks, the monitor panel drivers are actually contained in the video adaptor files & are installed at the same time.
There is most likely a utility ( ati util ) that runs in the background so set the resolution through there utility and that should solve the issue where as if you set it through windows display properties it will continue to do the above.
ATI video cards go here for the latest drivers. http://ati.amd.com/support/driver.html
Please select your operating system, product family and the product and then select Go. Radeon drivers & Catalyst Control Center as recent as 1-16-2008
...if you do this (or have done it) and it does not work properly, try reinstalling the operating system and then installing those drivers fresh after install. That should work. If it doesn't, look in the Acer user's manual for the machine's maximum resolution (for example 1024x768), and then changing the video driver to one of the standard Microsoft drivers, for only that resolution. The problem you are having above seems to be that you tried this solution, but loaded a MS driver for the wrong resolution. So you are probably pretty close on it.
Well, I'm amazed a C640 runs Vista at all.
There's no reason to buy a new hard drive, except for the novenlty of having one loaded with Vista on a C640.
It's a great laptop, and runs Windows XP PRo perfectly well.
If you have one od the Dell XP install disks, just boot from it, and whenever it finds the vista install, hit excape, then at the next screen hit "D" to delete the partition, then choose "quick format", and load the Operation system.
If you need an install disk,let me know.