Hi all, i had problems with my SIOtoPC USB with Windows 8.1,
the solution is simple, goto Device manager, and install the driver manually:
Device manager: install drivers---> then it asks you to search/browse a driver, select the 64 bit drivers folder , then its DONE ! :O
Im posting this, to show all people that it also works on Windows 8.1, but you need to install it manually.
Awesome, mister Steven Tucker!
Regards,
Wolf