Fix Microsoft Bus Driver error (RealTek HD audio)

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If you have had a “Microsoft Bus Driver should be loaded to your system before installing Realtek HD Audio Driver” error message when installing the driver for a Realtek HD sound card, then this solution is for you. Some of Realtek’s newer sound cards using the RealTek High Definition audio chipset have had the problem.

There are a couple of solutions to fix this Microsoft Bus Driver error – both of which requires you to install Microsoft patches.

How to fix Microsoft Bus Driver error

Fix Microsoft Bus driver update error
Download and install the KB835221.exe fix from Microsoft.

This fix is likely to solve the error for most sound cards, but you may not have it working yet. If so, follow the next method.

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Alternate fix for Bus Driver error for Realtek HD cards

Microsoft Bus driver error : How to fix
Download and install the Q888111 patch. This has two separate versions – download the appropriate fix from the links below.

For Windows XP SP2
For Windows XP SP1

Fix Bus Driver error on Windows XP 64-bit

Users of Windows XP 64 bit require another fix – Q901105. Download and install the patch to fix the error.

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