1. Click "Start", click "Run", input "devmgmt.msc" (without quotation marks), and then press "Enter".
2. Double-click "Sound, video and game controllers" to expand it.
3. Double-click the installed Sound Card to open its Properties.
4. On the General tab, please check the message in the Device Status section.

Then, if the device is working properly, please follow these steps to check the sound settings:

1. Click "Start", click "Run", input "mmsys.cpl" (without quotation marks), and then press "Enter".
2. Click the "Audio" tab, choose the installed Sound Card as the default sound playback device, and click "Apply".
3. Click the "Volume" tab, remove the check mark from the "Mute" box, and click "Apply".
4. Put a check mark next to "Place volume icon in the taskbar", and click "OK".

In addition, please double check all cable connections between the sound card and speakers. Please make sure the speakers are correctly connected and the power is on.

Meanwhile, if your computer is Gateway, you may refer to the following article to enable Digital Output:

Title: No Audio After You Install Sound Blaster Live! Sound Card
Link: http://support.microsoft.com/default.aspx?scid=kb;en-us;Q313022