With Windows 8 the Matrix 64 bit drivers are no longer signed, this means that Windows 8 will no longer allow them to be installed by default.

There is a work around however which is available here:

https://www.windows7hacker.com/index.php ... windows-8/

If you use Windows 8.1 or Windows 10 there is a fix here:

https://www.howtogeek.com/167723/how-to- ... d-drivers/

Warning: Third party sites - verified at time of posting