Hello all

I am just new in the forums and my English isn't the best tough...
Like the title says, people can't hear my on Teamspeak 2, but they can hear me on all other programs??? I tried already a lot, but with no success... It even became worser. At first they could hear me very quiet, but now they even can't hear anything. Even when I set voice output to Voice Activation, and I shout as hard as possible, my green light doesn't lights up.
Could you please help me?
Thanks in advance!!!

Specifications:
Microsoft Windows XP Home Edition SP3
Intel Pentium 4
NVIDIA GeForce3 Ti 200
SB Live! Audio [A400]

Sound cards: CMI8738/C3DX PCI Audio Device
Creative EMU10K1 Audio Processor (WDM)