I am a new poster on F-Chat and I am inclined to ask for help purely based on the solutions members have recommended for other members having computer problems with success I was hoping I could be as fortunate. My windows media player will play movies without sound? It won't play some movies at all saying that there is a problem with my sound device or I don't have one installed then when I insert a music CD I get the same message all the time. I have uninstalled and reinstalled the sound driver 3 or more times and the results are painfully the same. It all happened after I got the computer back from having a couple of larger hard drives installed. The person who installed the new drive(s) left town, how nice. The computer had sound for a few days after the drive work and then this started. My device manager indicates that said "sound device" is working properly, however the problem still exists. The factory driver that I downloaded from Silicon Integrated Solutions had a couple of test files to be played so after the install I opened the first test file which was a midi orchestra and it was heard through the speakers. The second was a .wav file and the error message listed above re: the sound device error was again displayed. I have called and paid for tech support from SONY and Microsoft, and went to the company (SiS) that manufactured the sound device and drivers and no results. I was hoping maybe someone on F-Chat could give me a trick to get this computer back up to speed. The computer - Sony VAIO OS - Windows ME Windows Media Player has been updated to the latest version. I would greatly appreciate any help or ideas in this annoying matter. Thanks in advance. Regards to all, David C.