Since you appear to know how to get to device manager, I'll skip that...
Go to control panel, System, Advanced, Environmental Variables, User variables for (your name here)
Click "New" and enter this: devmgr_show_nonpresent_devices
Now, go to device manager, View, Click "Show Hidden Devices" and look for your sound card there. It may be greyed out. Right-click to uninstall. When completed, Click Action, Scan for new hardware,
and if sound card is found, install drivers again, unless your sound driver has a self-installing package. In that case, run the sound card installer instead of scanning for new hardware.