Hello yorgo,
Windows 10 was first qualified with Pro Tools 12.5. See
avid.force.com/pkb/articles/Compatibility/Pro-Tools-Operating-System-Compatibility-Chart for more info.
If you have a backup (or your Windows 7 installer) you can roll your OS back, or you can upgrade Pro Tools. See
shop.avid.com/ccrz__ProductDetails?sku=DYNA20008 for details.
Best regards,
JC