Headphones not detected in Windows 7

Hi, until about 2 weeks ago I have had no sound problems with my 17" 2011 Macbook Pro. I use Windows 7 64 Ultimate via Bootcamp.
Suddenly the computer no longer detects if headphones are plugged in or not. I have to manually use the sound device settings to switch between headphones and speakers. This was working fine until fairly recently.
Have applied all the latest updates on both the Mac OS and Windows sides.
Appreciate the help

Ok the SMC / PRAM process works to revover the headphone on OSX Lion, pfiou!
I try under Windows 7 now & let you know
FYI :
Reset the SMC > Resetting the System Management Controller (SMC)
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Wait fifteen seconds.
4. Attach the computer's power cord.
5. Wait five seconds, then press the power button to turn on the computer.
Then the PRAM >  About NVRAM and PRAM
1. Shut down the computer.
2. Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
3. Turn on the computer.
4. Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
6. Release the keys.

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