Hi, I have windows vista 64 bit SP1. My sound card is an integrated Realtek HD 5.1. Picked up the Logitech x-540 speaker system yesterday and installed them today. While doing the test. I can not get the front 2 speakers to work as the front L/R speakers. They will only work under 7.1 as the Surround sound side speakers. Every other speaker works in its correct spot during test. Supposedly its only a 5.1 card. So why does it have a 7.1 setting on the sound setup. Hate to have to take these back as they were a good deal. Do I have a bad channel on my brand new computer sound card? Any idea on what it could be? Thanks in advance.