hi, i'm using window XP SP2, it works fine but when i upgraded it to SP3, since i upgraded it, the PC get slower and won't recognize my multimedia audio controller(no sounds) anymore. I'm using Intel Pentium 4 3.00GHz and my HDD has 76 GB. I have 4 fans installed and removed 1 HDD that has 40 GB memory and make my OS back to SP2, the PC is now back to normal but the multimedia Audio controller still can't be recognize or no sounds.