For an automatic installation of windrvr6.o/.ko with each boot, add the following line to the file /etc/rc.d/rc.local:
<path to wdreg>/wdreg windrvr6

In older versions of WinDriver you may need to add the following command to the rc.local file instead of wdreg:
/sbin/modprobe windrvr6
(For v5.2.2 or earlier of WinDriver, replace “windrvr6” with “windrvr”.)