How to stop play sound via both Headphone and Speaker [Urgent]

[suyaku92]

I am using Dell Inspiron 15R N5010 laptop. Yesterday, I made several updates (Windows 7 Ultimate 64-bit updates, upgrade to K-Lite Mega Codec Pack 7.8.4 and K-Lite Codec Pack 5.3.0-64bit, upgrade to Avira Free Antivirus 2012 and so forth...). After that, when I play sounds and plug my headphone, the sounds keep playing through BOTH headphone and speaker.
This is extremely annoyed me because I have to work in the library, lab and class room with my laptop usually and I can't listen to music while studying with this problem.
Do anyone know how to fix this issue?
Thanks in advance.

 

[fireberd]

Did you install a different sound driver? You must use the Dell supplied sound driver for proper operation.

Here is the Dell IDT driver. Reinstall it and see if that corrects it.
Drivers and Downloads

 

[suyaku92]

Did you install a different sound driver? You must use the Dell supplied sound driver for proper operation.

Here is the Dell IDT driver. Reinstall it and see if that corrects it.
Drivers and Downloads

Thanks but after I found the problem, I reinstalled this sound driver for my laptop but the problem was not fixed.

 

[fireberd]

As there were apparently many updates made it's hard to say which one could have caused the problem. Maybe a System Restore back to a date prior to all the updates will fix it?

Someone on the Dell users laptop support forum may be able to help. Laptop Audio Forum - Laptop Audio Forum - Laptop - Dell Community

 

[suyaku92]

Thanks for ur help but I deleted all the back up but the latest restore is the date after update
I installed another music player so I have each player for each device..
But if anyone know any solutions, plz help me.