Sorry for the delay in replying but had to replace my router & bride's adapter card.
I guess I was a bit lax in details. Since I retired (from computer repair), my input isn’t what it should be. Besides what I mentioned earlier, these are all the things I’ve run/checked (not necessarily in chronological order but how this old dog’s memory works):
Verified Windows, all other apps & drivers were latest edition
Ran msconfig to verify nothing but bare necessities were loaded @ start-up; also deleted a few unneeded apps on her PC using Revo (also to verify nothing new was introduced to her system)
Device Manager shows no conflicts Process Manager shows very little CPU usage & CPU running cool (Intel 4 1.5GHz with 1.5MB RAM)
Ran CCleaner, deleted all junk files & fixed all registry issues
Defragged HD using AusLogics & later with Puran (thanks for that bit of info, it’s even faster than Auslogics & seemed to do a better job)
Updated & scanned HD with MBAM, Spybot & Avast; nothing found
Also, ran chkdsk and sfc
Finally, I think, I ran DirectX Diagnostic tool & after testing under Sound tab I got the following error message: ‘Your sound card does not support hardware buffering. Sounds will only play back from software buffers.’ In the Music tab, all sounded fine with no errors.
Downloaded & installed VLC. Voila! All works, somewhat again!
Sound is much better but still not perfect. Tried going to YouTube to play a file there & sound still bad. Music I had on my PC & shared with hers played pretty good, but it did not like it when I tried to multi-task (garbled again). Inserted music CD’s & file extensions on all songs were changed to *.cda. linney, headphones showed no improvement.
Ben, I’ll try that website you sent and .wav files still play fine.
As added info, M$ Security Essentials stopped working & will not allow me to reinstall. Comodo firewall is acting strange, won't remember answers to allow/block. Ah! Talked with the bride & according to her after each reboot, New Hardware Wizard pops up to install 'Creative Gameport Device'. Obviously, I need to explain to her all details are important. I uninstalled the driver & rebooted but windows can't find a driver for it, but then again, I can't either. She won't upgrade to 7 (took me forever to get her to go from 98 to XP. I may just buy her a new audio card.
Will let all know how things go soon & thanks again to all, Bob