Thank you for posting your concern on the forum.
As per the issue description the display drivers are not compatible with Windows 10. So, still if you want to upgrade to Windows 10 technical Preview you may try and install the drivers of Windows 8.1 in compatibility mode.
Make older programs compatible with this version of Windows
If you will upgrade your Operating system from Windows 8.1 to Windows 10 then nothing will be overwritten, all of your programs, games, documents, pictures, desktop icons etc will be there. Nothing will be lost, but there might be some compatibility issue as the drivers for Windows 10 are not released by computer manufacturers.
Here is the link which provides you the information about the new features added in Windows 10.
To know the system requirements you may refer to the article mentioned below.
Windows 10 original OS has not been launched yet. It is still the preview version. If you want to install the preview version you may refer to the links provided below. There are some third party who are promoting Windows 10 pop up/icon. If the icons are from any third party you need to ignore them.
Hope the information provided is helpful. Do let us know if you have any queries related to Windows, we will be happy to assist you.