If you are reading this, you are likely staring at a "Yellow Exclamation Mark" in your Device Manager. You’ve unearthed a vintage PCI sound card—the Crystal Semiconductor CS4280-CM —and you want it to work on your Windows 7 64-bit machine.
Let me save you hours of frustration right now: Crystal Cs4280-cm Driver Download Win7 64-bit
Download the Legacy AC'97 Driver Pack v2.83 (via MajorGeeks or Vogons), force the Microsoft generic driver via Device Manager, and accept that you will have no microphone input. Or, spend $10 on eBay for a newer card. If you are reading this, you are likely