Hello Negrito2882
To solve your problem you need a USB sound card like this one: SPEEDLINK Vigo USB Sound Card (USB) so you should be able to connect your headset.
Greetings John
I think this should do it:
Lindy Headphone-PC Adapterkabel (Stereo, Headset-Adapter)
Or this, if you have an older headset with "standard" (non-smartphone compatible) wiring:
Lindy PC Adapterkabel (Stereo, Headset-Adapter)