Hi,
There could be a problem with the jack, but try the following and let me know.
Open windows Control Panel, open Device Manager and open up Sound, Video and Game Controllers. Right click the IDT device and select Properties. Click the Driver tab and then click 'Update driver'. Select 'Browse my computer for driver software' and then select 'Let me pick from a list of device drivers on my computer'. Left click 'High Definition Audio Device' once to highlight it and then click the Next button to install it.
Has this made any difference?
Regards,
DP-K