I have 5.1 surround sound speakers on my desktop PC and they were working fine before I packed up the PC. Now I have set it up again, only the front speakers are working. I have made sure that in the device manager they are down as being surround sound speakers and have 5.1 selected. The only difference I can think of is that when I switched the PC back on it downloaded SVC pack 2 for VISTA. If it set it up as being a 7.1 system then all of the speakers work though looking at the test page in VISTA clearly the system is looking for another 2 speakers. Anyone have any ideas ? All of the cabling is as it should be etc.