Okay, just installed XP on new drive, with service pack 2. I get a weird noise, occasionally, mostly about a minute after I sign on to the net. It sounds like an arrow hitting an archery target, or someone cracking a whip. "whip-ish". These are the programs I have installed. XP/Service Pack 2. MSN messenger AIM messenger Giant Antispyware Bitdefender AntiVirus Does ANYONE know where this sound comes from? Is it a trojan or something? This is the first time I have heard it..