If your sound goes out on your Windows install but returns once you reboot it could be a problem with your microsoft kernel wave audio mixer driver.

Here is the fix:
1. Go to Control Panel
2. Double-click on System
3. Select the Hardware tab and them click on Device Manager
4. Click on the View menu item and then select Show Hidden Devices
5. Go to the Sound, Video and Game Controllers Group and locate the tagged Microsoft Kernel System Audio Device
6. Right-click and then choose Update Driver
7. When asked to connect to Windows Update, choose “No, not this time” and click Next.
8. When asked what you want the wizard to do, choose “Install from a list of specific location” and then click Next.
9. Insert the OS Installation CD on your CD drive.
10. When asked for the search and Installation options, choose “Don’t search…” and click Next.
11. When asked to select the device driver that you want to install, highlight click on the Microsoft Kernel System Audio Device and then click Next.
12. After the driver is installed, you may need to reboot for it to take affect.

Good luck

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