Need Audio Help -- I have nowhere else to go to ask for help at the moment

I truly hope this isn't a bother, but I'm having issues with my computer.

I just installed windows 7 onto a new SSD and have been catching up on installations, file transfers, etc...

The Mic on my Headset (which was working perfectly the day before) is not working (Sennheiser PC 350, 3.5mm).

So, I installed the realtek hd audio codecs and rebooted

It appeared, on Skype, to recognize the mic and all seemed well, but...

10 seconds later it wasn't working again.

Any advice would be appreciated. I don't think it's a physical problem with the mic itself (it's not broken) and I really would like to figure out a way to get this to work as the quality on it is pristine and I'd hate to go back to some shoddy USB mic.

Thank you.