Connecting hifi sterio speakers to my pc
It seems quite likely (since you provided no useful details) that your "stereo speakers" are NOT "powered" (have their own internal power amplifier).  So, to take the audio out of your computer, you need an audio power amplifier to generate a signal strong enough to drive typical stereo speakers.  There are many small and inexpensive "Class D" and "Class T" audio power amplifiers available that would do a great job at a very low price.