D-Link DWL G510 (rev C) as an access point...

Hi, I've had a D-Link DWL G510 Revision C NIC card for a while now and I remember when I first got it, I managed to set it up as an access point. Recently it has stopped working and I can't seem to get it to become an access point again. Last time I used the Gigabyte SoftAP application and just selected "Switch to SoftAP mode" when I right clicked on the icon. However, this time around, that doesn't seem to be in the menu and the application won't pick up my network card. It says:

GIGA-BYTE Wireless LAN Card
Not exist

when I hover my mouse over the tray icon.

This describes the process I used the first time: Ralink Soft AP - PHWiki

And according to this: Ralink chipsets based wireless devices my NIC is supposed to be supported.

Does anyone have any ideas on why its not picking up?