You didn't disclose the notebook's model /manufacturer and also when XP Home was installed, your headphones worked. Anyway, the idea it's to go to manufacturer's site and search for windows XP audio drivers.
Trying to unweave, unwind, unravel
And piece together the past and the future,
T. S. Eliot
I've had to put a different operating system on my computer for work purposes. I'm able to listen thru the laptop speakers, but when I plug in my headphones, no sound. What drivers do I need to download and install to get it to work? The laptop came with Windows XP Home on it and I reloaded it with XP Pro. The processor is a AMD 64 Mobile Athlon. Thanks for you help in advance.