Cine_eater: Are you using non-vanilla mp3 files? There are a couple things you can try. You were talking about FFDShow. You can try to install a codec pack which will install it, but the problem is when it's set incorrectly, not if it hasn't been installed. If you do want to try installing FFDShow to see if it'll help, try the K-Lite Codec Pack. The Basic version installs the bare minimum files and is very easy to remove completely if you don't like it. All versions install FFDShow correctly for Fallout. I use the Standard version, but that's because I prefer MediaPlayerClassic to Windows Media Player. If that doesn't work, try to make mono versions of your songs and use those instead of the stereo files (named as the stereo files were). My current working theory is that the game uses mono files to "track" song progress. That's why GNR's stereo mp3 tracks all have _mono mp3s as well. I recently switched out my stereo mp3 for mono mp3s (128kbps, mono, CBR), and deleted the _mono.mp3 files. I'm still testing it out, but so far it seems that the stuttering is almost completely gone. I'm working to get this kind of dependability out of stereo files, but so far the mono songs seem significantly more dependable than stereo. My computer, which runs stereo files without much problem, is completely bulletproof when using mono instead. If I can think of anything else, I'll be sure to let you know.