Re-Install Dimension 3100/E310 Windows XP - Sound Not Working

I have a Dimension 3100/E310.  It is running Microsoft Windows XP Media Center Edition 2005.  Due to hacking, I reinstalled Windows XP with my Reinstallation DVD.  Also Restored files from Backup.   Sound is not working on You Tube videos, Windows Start-up sounds, Windows Shut Down, etc.  Have checked My Computer/ Management / Device Manager / Sound, video game controllers,  Found Working Properly: Audio Codecs, Legacy Audio Drivers, Legacy Video Capture Devices, Media Control Devices, Video Codecs, Virtual Audio Device.  All Volume Controls are On.

I appreciate any suggestions to get my Sound back on.

Thank you!

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