Hi nazuo,
Thank you for visiting Sony Community!
"So I upgraded the PC using a USB key to windows 10."
I believe you did a clean install, right? You didn't mention upgrading the OS to Windows 8.1 first. The issue won't be fixed by skipping an upgrade process. We always recommend solving an issue one by one and considering the proper way of upgrading the OS.
Since we're already running the latest operating system, kindly download and install all the drivers and software from Sony support website. SVF1521C5Eappears to be a non-U.S. model.
For further assistance, we kindly recommend visiting our Sony Global Website for information on contacting the Sony Support Center in your region at http://www.sony.net/SonyInfo/Support/.
Best regards,
Vincent
Answered your question? Glad I could help! Please Click the "Accept as Solution" button below.