Statics on TV tuner reception when browsing the net

My house has cable Internet from Time Warner. My computer go online via D-link AirePlus 802.11g router and Wireless USB adaptor.

As a result of cable internet, I also get some basic cable TV channels to watch. I watch it on my PC as it has ATI AIW

8500DV card. The problem is whenever I browse the net or downloads anything from the net, the TV gets statics (white horizontal lines with popping sounds). The cable that I used from the cable signal splitter to my PC is 50 feet long. But it's fine when I'm not browsing or downloading. What could be the cause of the statics on the TV tuner reception?
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