Hi, My PC runs on Windows XP Professional SP2. Today when I turned on my PC, I found that my desktop appearance had changed, more specifically the start taskbar was the white Windows classic version, not the usual blue XP version. But I didn't take it much seriously, thinking somebody else might have changed settings before me. But then when I tried to play music in Windows media player, the program signalled an error, stating that my sound card or drivers(Realtek audio) were not properly connected or were malfunctioning. I tried to play in other media players, but was not able to get audio output. So I checked my device manager, to confirm whether the soundcard was detected. I was shocked to find that the list of devices was empty. But almost all other hardware except the sound card, seem to be working fine! I was now suspecting a virus, although there had been no recent downloads or installations from unknown sources. So I ran a virus scan(Norton) and still nothing showed up. Then as a last resort, I tried System Restore and got my second shock, when I found that all previous restore points including the ones I set manually, were gone! I have run out of options Has anyone had any experience or knows of anything similar? Is a reloading of the operating sysytem the only way out? Thanks in advance.