Everytime I download a file (.mp3, .doc, .rar, .pdf, .html, .etc) they are corrupt and /or unopenable. The music files play a few seconds then start over. Compressed files won't expand. This is on Limewire and other apps.

Am I screwed or is there anything I can do to fix this?

OS - Mac 10.4.4
Connection - T1
App - multiple