High pitched noise when TS is open

[lbennett]

I've searched around for this problem but couldn't find a solution anywhere.

Specs:
Windows XP SP3 - fully updated
SoundMax HD Audio
Saitek Cyborg 5.1 Headset - reinstalled drivers, no change
Don't think any others are needed, let me know if they are.

When using my headset I get a high pitched noise when TS is open before I even connect to a server. I've tried muting the mic, pulling it out had no effect either, tried different TS codecs, all the options in TS have been played with and the only thing that had any effect was changing the input sound device to SoundMax HD Audio (Although I'm using my headset which uses C-Media CM106 Like Sound Device for input and output). But obviously that then means I can't use the mic which is no good.

Everything in TS works fine and only I can hear the sound so basically I'm all out of ideas. Hope someone can help