Be Right Back, Uninstalling

for some reason my mic doesn't work on tf2, works on l4d2, can use it on windows movie maker, Even in the steam settings shows the mic working, but as soon as I launch tf2 & try the mic test I maybe once get a blip of sound, then acts like the mic isnt plug in. I checked the steam fourms & their "make sure the config for the voice is 1 " which it was already :u anyone having mic troubles on tf2?

What OS are you running?

From steam system info
Processor Information:
    Vendor:  GenuineIntel
    Speed: 3198 Mhz
    1 logical processor
    1 physical processor
    HyperThreading:  Unsupported
    FCMOV:  Supported
    SSE2:  Supported
    SSE3:  Supported
    SSSE3:  Supported
    SSE4a:  Unsupported
    SSE41:  Unsupported
    SSE42:  Unsupported
   
Network Information:
    Network Speed: 
   
Operating System Version:
    Windows XP (32 bit)
    NTFS:  Supported
    Crypto Provider Codes:  Supported 323 0x0 0x0 0x0
   
Video Card:
    Driver:  VisionTek Radeon X1550 Series Secondary

    DirectX Driver Name:  ati2dvag.dll
    Driver Version:  6.14.10.6925
    DirectX Driver Version:  6.14.10.6925
    Driver Date: 11 Feb 2010
    Desktop Color Depth: 32 bits per pixel
    Monitor Refresh Rate: 60 Hz
    DirectX Card: VisionTek Radeon X1550 Series
    VendorID:  0x1002
    DeviceID:  0x7183
    Number of Monitors:  1
    Number of Logical Video Cards:  1
    No SLI or Crossfire Detected
    Primary Display Resolution:  1024 x 768
    Desktop Resolution: 1024 x 768
    Primary Display Size: 11.54" x 8.66"  (14.41" diag)
                                            29.3cm x 22.0cm  (36.6cm diag)
    Primary Bus Type Not Detected
    Primary VRAM: 512 MB
    Supported MSAA Modes:  2x 4x 6x
   
Sound card:
    Audio device: Realtek HD Audio rear output
   
Memory:
    RAM:  2047 Mb
   
Miscellaneous:
    UI Language:  English
    Microphone:  Not set
    Media Type:  DVD
    Total Hard Disk Space Available:  553230 Mb
    Largest Free Hard Disk Block:  24655 Mb
    Steam Hard Disk Usage:  165485 Mb
    OS Install Date: Sep 16 2008
    Game Controller: None detected

The head set I'm using is a plantronics, I just tried to Realtek audio to change the mic jack, it kinda work, More blips then anything :/