As stated when you installed the trial you will have to reinstall your previous operating system from your original media. If you don't have the original media, but have the activation key you can download your version of Windows from the internet. The
download site will vary with your version of Operating system. Be sure to back-up anything you can't afford to lose. Hope this helps and if you need any further assistance post and we will be glad to help you
The above opinion is mine and mine alone and doesn't necessarily reflect that of Microsoft, it's employees, or any other member of this forum.
"When we try to pick out anything by itself, we find it hitched to everything else in the Universe" - John Muir
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