Ever since I installed a cracked version of cubase*, iTunes will not play any mp3 or mp4 files correctly (by that, I mean everything sounds similar to modem noises mixed with loud radio static; also, mp4s have no visuals, just a black screen). WMP, WinAMP, QuickTime and Firefox will play the same files normally, and my iPod is completely unaffected, even after adding some new songs and synching. So I know my music isn't corrupted. Also, iTunes will play m4a and wav files normally. * It wasn't malicious, but I am certain that it is the cause of this problem as iTunes worked normally a day prior to me installing it. I have already tried: Reinstalling iTunes (just iTunes, not all of the associated programs you are supposed to uninstall when you want to completely uninstall it). I have the most recent version of iTunes as well. Updating my audio/video drivers through the device manager. A few didn't update automatically, so I can't say that I completely explored this option yet. Uninstalling the cracked software that caused this. Several fixes for problems that were listed on Apple's support page. None of them seemed to be about the specific problem I have right now. Some more fixes a google search yielded. Like the apple page, they didn't seem relevant to whatever my problem is. Unfortunately, I didn't think of backing up anything before running the installer. I wish I did Computer Specs Win XP Pro Version 2002 SP3 AMD Athlon XP 3200+ 2.19 GHz, 2.00 GB of RAM Audio driver (according to the dxdiag tool): NVIDIA nForce Audio Aside from a fix that actually works, I really want to know what has been corrupted so that I can refine my searches and maybe find a solution. So, if you think you know something that could help, please post it. If I didn't provide enough info, please say so!