Windows 10: Lost sound driver in HP Touchsmart AIO when upgrading from 7 to 10

I obtained this (rather older) desktop AIO with Win 7 and I just upgraded to Win 10. In the process, the sound driver disappeared. I have googled with nothing helpful turning up. I got a popup type message saying that no sound device (or words to that effect) could be found and it offered to diagnose. I have run the diagnostic with no cure offered and, not being very tech savvy, do not know what to do next. What information can I provide? I will be grateful for any assistance

:)

 

HP Envy TouchSmart 4-1115dx NO TOUCH in Win10 /w SSD

HP ENVY TouchSmart Sleekbook 4-1115dx More Support Options | HP® Customer Support

See if you can run through these troubleshooting steps:

HP PCs - Troubleshooting Touch Screen Issues (WindowsÂ*10, 8) | HP® Customer Support


Step 1: Confirm the computer has a touch screen
Step 2: Enable and reinstall the touch screen driver in Device Manager
Step 3: Configure the touch display
Step 4: Install Windows updates
Step 5: Perform a touch screen diagnostic test in HP Hardware Diagnostics
Step 6: Adjust the power management settings for your touch screen
Step 7: Perform a hard reset (notebook PCs) or full shutdown and restart (All-in-One PCs)
Step 8: Update the BIOS and graphics driver

 

HP Touchsmart 600 bootup issues

It's a Win 10 feature, the computer is at Win 10.

 

Windows 10 Upgrade on Old Hp Touchsmart

I wasn't able to upgrade my HP Touchsmart 600 (1040ch) to Windows 10. It just hangs on first boot and reverts back to windows 7...Trying for days now, haven't found a solution yet.