Headset

I've had this head set for a while. It a Sound Blaster Arena Surround headset. Normally I have no problem switching between my main soundcard and my usb soundcard (headset).

After restarting earlier today i am not able to switch the default audio device. Certain programs only use the default sound device to emit sound.

Is there something that im doing wrong, i goto my sound devices, click on my head set, then use as default. When i hit ok and go back to that window it says my speakers are back to the default device. When i select my headset the apply button doesn't enable.

Whats wrong?

I do not have a "Realtek HD Audio Manager" icon in my control panel. And the headset is a USB headset.

nothing, all drivers are up to date.

Yes, and Yes, i've actually tried all of my usb ports. all do the same thing.

Yes it is USB.
I plug it into another computer it works.
It works in this computer but will not set as default.

Specs are,
AMD Phenom II x3 3.2 Ghz
4 Gb RAM
64-Bit Windows 7 Ultimate
9800Geforce
HD Audio Sound/SB Arena Surround Headset