I'm using Windows Xp on my Acer aspire 5100 notebook. I'm using the cheapest genius mic for recording stuff. Whenever i hit record in any audio software the recording starts normally and then all of a sudden the waveform's amplitude in the program's display shrinks. When i playback what i've just recorded, again it starts normally and in the place where the signal has gotten tighter it sounds like from a barrel or something like that. It also has a slight flanger effect to it. I didn't had this problem before. When i play solos in higher octaves there's a less chance that that will happen. But whenever i play riffs on the lower strings it always happens. I'm using a Squier Stratocaster which i connect to a Marshall AVT 50X. I put the mic in front of the amp and plug the mic into the laptop's mic input. If you need a sample i'l upload it and post the link.