Hi Kremmen,
Thanks for the reply. I have had some success using my laptop's mic or Line In jack for recording these tapes. I still want to sort out the problem on the desktop though .. it's become an irritant that won't go away. I think I'll have to dig into the hardware manual that came with the PC. Maybe its a case of RTFM.
After follwing the chain you suggested (Control Panel > Sounds & Audio Devices > Volume > Advanced > Options > Properties > Recording) I discovered that 'recording' is grayed out.
At the top, Mixer Device is set to "SoundMax HD Audio 0" (the other two options from the drop down menu here are "SoundMax HD Audio 1" and ReplayRadio Driver Mixer). Next, playback is selected, recording is grayed out and then "Other" is available to be selected (the only option in that drop down menu is 'EQ'). Finally, in "Show the following volume controls:' all options except 'AUX' are checked.
Again, thank you for your suggestions.
Cheers,
Bruce