Microsoft Help and Support says that "Code 28 (The drivers for this device are not installed)" appears when the Windows Sound System Compatible Driver for the Windows 2000 operating system is deleted upon the upgrade to Windows XP. It's possible to repair this code.
Click on "Start." On the "Start" menu, click on "Control Panel." In the "Control Panel" folder, click on "Performance and Maintenance." Click on the "System" folder in the "Performance and Maintenance" folder. Click on the tab titled "Hardware." Click on the box that says "Device Manager." Click on "Sound, Video, and Game Controllers." Right-click on the device that prompts Windows XP to display Code 28 (it should be Windows Sound System Compatible Driver, also called the WDM driver). A drop-down menu will appear. Click on "Update" and an Update Wizard will guide you through the installation of a new device driver, which should stop Code 28 from appearing on Windows XP.
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Click start control panel administration tools computer management device manager scroll to sound video and game controllers you might see a yellow question / exclamation? ! mark or a red X Right click to reinstall drivers If your computer came with a motherboard disk the drivers could be on it or you might download slimdrivers. Rather doing a driver hunt
http://download.cnet.com/slimdrivers-free/3000-18513_4-75279940.html Windows XP/Vista/7/8 Note: it will find all of your outdated drivers This is a free driver solutions which will automatically search for and find the correct driver You will have to update every driver individually once you update you might be asked whether you want to restart or make a system restore point. Click no to both of these then continue updating each driver free then restart once all of the drivers have been updated. It might take some time being free
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