Do i need a audio system for my pc.


They might use some weird old audio cables that are obsolete. What do the cables look like?
 
If they are regular stereo speakers you will need a splitter something like this: http://www.amazon.com/3-5mm-Mini-Plug-Computer-Stereo/product-reviews/B000LMFS7M/ref=dp_db_cm_cr_acr_txt?ie=UTF8&showViewpoints=1
to connect your speaker out from the computer to the left and right Pre-Amp IN inputs on a stereo amp. Then just wire the speakers to the stereo amp as you normally do. You may be able to find a connector like that locally at a computer or audio store.
Set your Windows speaker audio out volume to about 35% to start with so as not to overdrive the stereo pre-amp inputs. Adjust as needed.
 

thanks sorry about no pics my new phone still needs a sd.