Tv card or sound chip the cause of static noise?

My system has an MSI KT6V mainboard with an integrated AC97 soundchip. I
also have a Hercules Smart TV mono tv tuner card, which audio output is
connected into the line in jack of the mainboard. Every time, when I've
started my system and the machine has been running for a while (appr. ½
hours), a distinguishable static noise starts to hear from my loudspeakers.
I've noticed that if you mute the line in, the static is muted. Also if you
start up the tv viewing program, the static noise stops for good and will
not return as long as you keep your system running.
Now, is there something wrong with my tv tuner card, which causes "leak"
into the line in or what? I've looked for newer drivers for my tuner but
without success. At least Hercules doesn't provide any newer drivers for
this card. I've updated my sound chip drivers but that has not helped. I've
also tried a different cable between the cards. The funny thing is that I
don't recall this kind of behavior to have occured in my former system that
had a separate Hercules Muse LT sound card.
Should I try to get a hold of a sound card or should I just ditch the tuner
card and get an s-video connector box, since I really do not have any use
for the tuner. I just use the card to connect external video sources.
However, if there is any solution to rectify the problem without making
changes into my system, I would be grateful.

I'll make a collective reply.
osnavi: My system is pretty stable temperature-wise. Well below 60 degrees celsius.
Fredrik: I've tried couple of PCI slots, at the moment the card is as furthest away as possible from the audio connectors. The system is attached to a grounded AC jack. My system is WinXP home SP2.
Stu: The card doesn't have FM radio. When looking from Hercules support pages, it seemed that newer drivers are (finally) available. Have to try those out. I'll report how it succeeded.

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