Option/Alt Key not recognized by Logitech G510

I installed Windows 8 Pro on my MacPro today and it all installed fine. The problem is I have a Logitech G510 illuminated gaming keyboard that I payed 100 bucks for and I love it. But when I restart and press the alt/option key the screen stays black for about 10 seconds then it just loads the Apple OsX. As if it Bootcamp never realized I am pressing the alt/option key . Getting another keyboard is not an option . Is there any fix for this problem?
Yes I have tried pressing other buttons like Ctrl and the Windows button , Nothing works.
Please if anybody knows a fix for this let me know.

I can't quite figure out what you were trying to use on your "usb" to install Mavericks. It has to be a bootable USB installer of some sort. It doesn't sound like you were using a bootable installer disk.
I have used DiskMaker X a few times and it works very well. I'd do that if I were you. You would just boot from the USB drive that you make with DiskMaker X, use it to completely erase (i.e., reformat) your HD, and then install Mavericks.

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Option/Alt Key not recognized by Logitech G510

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