"DeskPro EN" is not specific enough. There are dozens of models from Compaq that match this description.
Please post a much more detailed listing of your components (especially your video card name and model!), or the EXACT model number of computer you have so I can look it up on HPCompaq's website.
The most likely problem is the wrong video driver is installed. As soon as you post again, we'll be able to suggest the right video driver, where to get it, and help with any other support issues.
Welcome to the forum!
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