Hello Elsa and welcome to the forum.
Have you managed to download and install a proper third party PDF reader on your Windows 10 machine.
Afterwards, because Windows 10 defaults to "Edge" for PDFs you'll want to set your choice of reader as the default
Control Panel\All Control Panel Items\Default Programs -> "Set your default programs" (link)
Select your choice of reader from the left column and then, at the bottom choose "Set this program as default".
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