HP Pavilion no longer plays stereo

I have a Pavilion a206x desktop PCc with Windows XP Home Edition for the OS, with Realtek AC97 Audio. The PC was purchase in 2001 or 2002. A serious infection recently required a complete recovery of the system. Prior to the system recovery I was able to play CDs/DVDs and listen in stereo. Since the recovery, I have no sound from the right speakers or from the right side of stereo headset. I have recently downoladed and installed/updated the drivers for Realtek AC97 Audio for Windows XP. That did not solve the problem. There is still no sound from the right speakers or right side of the headset.
I would appreciate any suggestions as to what the problem might be and how to correct it.
Thanks for any help.
Rob

Rob, welcome to the forum.
Have you checked in the Control Panel to assure that all of the settings are correct? When I have sound problems, this is the first place that I check. I don't understand how the settings can change by themselves, but they sometimes do.
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HP TouchPad - 1.2 GHz; 1 GB memory; 32 GB storage; WebOS/CyanogenMod 11(Kit Kat)
HP 10 Plus; Android-Kit Kat; 1.0 GHz Allwinner A31 ARM Cortex A7 Quad Core Processor ; 2GB RAM Memory Long: 2 GB DDR3L SDRAM (1600MHz); 16GB disable eMMC 16GB v4.51
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