Hello

I booted up my laptop today to find that my Gaming Headset's Microphone was not working! The Headset is a Fatal1ty CREATIVE series. I have not damaged it in any way, and have treated it with upmost care. I really need this mic, because I am a commentator on Youtube!
After a few reboots, but my MIC still refusing to work, I tried tweaking a few settings to no avail

Then, I unplugged the headset, and found that the laptop's onboard Microphone was still working :O
I would use that MIC for my commentary, but the quality is REALLY BAD!
Has anyone had a similar problem, and/or knows how to fix it?
The laptop is a Dell XPS L502X running Windows 7 Home Premium x64!
THANKS!