Hi Viktor,
Hope you are keeping well.
You are trying to install older drivers on Windows 8.1 machine. Please install latest Sentinel Protection Installer 7.6.8 from " http://sentinelcustomer.safenet-inc.com/DownloadNotice.aspx?dID=34359738400 " and share your findings.
Also let me know, are you facing this issue on physical or virtual machine? If VM then did you enable any extra settings in VM?
If you get same BSOD error then send one email to "support@safenet-inc.com" with kernel level crash dump.
Regards,
Anubhav