No audio on Win7 PC

Minitioune receives Video & Audio fine on Win 10 Laptop, so I know everything on TX an RX ok. However, I cannot get audio on my Win 7 Desktop under identical conditions (Video Perfect).
I can't see anything on the sound mixer anywhere. Where am I going wrong.
S2QPSK,SR=333, F=437Hhz - Tx from Portsdown/Lime combination
Regards
Graham M1ASR
I can't see anything on the sound mixer anywhere. Where am I going wrong.
S2QPSK,SR=333, F=437Hhz - Tx from Portsdown/Lime combination
Regards
Graham M1ASR