I have the same issue.
The setup is Windows Vista Home Premium 64-bit loaded on an Asus P5N32-E SLI
PLUS mainboard with a Creative Sound Blaster Xtreme Gamer sound card
recieving from a Logitech headset.
I have checked and double checked the following: mute button, correct ports,
line volume, internal volume, record device priority, headset input jack
integrity, and other headsets. Everything in the "duh" catagory checks out.
This card and headset have worked in numerous set-ups I have used in the
past, including Windows XP and XP-64. I have tried numerous driver
re-download/reinstalls and two OS reinstalls. Nothing seems to work.
I've noticed quite a few others who have this exact issue but differing
hardware less the sound card and OS. Therein lies the souce of my problem.
Any help, if possible, would be much appreciated.