I'm having a Dell Dimension E521laptop on which i had installed Windows Xp as my operating system. The sound on my system seems to be working perfectly fine when i play music off itunes, cds or dvds. But the problem is that when i try to play any music on internet, it won't work on any internet page with any browser or anything downloaded connected to the internet. Can any body tell me that why does sound on internet doesn't work on my system? Does any body knows about it? Kindly provide me the correct solution for the above issue.