When your computer has a conflict between SP3 and Realtek HD audio driver, right-click My Computer, select Properties, click Hardware tab and click Device Manager, double-click to extent Sound, video and game controllers, you will see there is a black exclamation mark in a yellow circle beside Realtek High Definition Audio. Try to reinstall drivers several times, but fail.
This problem would only possibly happen to Realtek High Definition audio users, and Realtek ac97 audio users would never come across such an issue. You can troubleshoot this conflict by modifying SP3 to SP2, specific instructions as follows:
Step 1 Click Start and then select run.
Step 2 Type "regedit" to open Registry Editor, under HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Control Windows, find out the DWORD value CSDVerision.
If the hex value is 100, the algorism value is 256, this system version is Service Pack 1 (SP1); if hex value is 200, algorism value is 512, this system version is Service Pack 2 (SP2); if hex value is 300, algorism value is 768, this system version is Service Pack 3 (SP3).
Step 3 Now you need to change the hex value to 200 and restart your computer, thereby the system version would roll to SP2.
Step 4 Now your version is sp2.Reinstall the driver.
Finally the conflict between SP3 and your Realtek HD audio