Windows Audio Session API (WASAPI) is the Windows-resident interface provided in Vista and later OS versions that supports exclusive bit-streaming to a specified device in native resolutions up to 24/96 via USB 2.0.
There are likey other issues with Vista 64 that may lead you to want an upgrade to Windows 7. But WASAPI should be resident and if so,
This is definitely the selection of choice - unless your DAC supports higher resolutions, e.g. 24/192 or otherwise directs you to another driver.
Media Center includes WASAPI as a standard option. Run WASAPI in Event Mode if possible (In some cases you may need to increase buffer size from the default of 50ms).
This allows your DAC to impose control of packet timing and size.
BTW, Media Center's core algorithms take full advantage of 64-bit mode when available.
Good Luck.
There are likey other issues with Vista 64 that may lead you to want an upgrade to Windows 7. But WASAPI should be resident and if so,
This is definitely the selection of choice - unless your DAC supports higher resolutions, e.g. 24/192 or otherwise directs you to another driver.
Media Center includes WASAPI as a standard option. Run WASAPI in Event Mode if possible (In some cases you may need to increase buffer size from the default of 50ms).
This allows your DAC to impose control of packet timing and size.
BTW, Media Center's core algorithms take full advantage of 64-bit mode when available.
Good Luck.