Did you have speed probs with Kazaa?

Those magnetmix files should download really fast, if they don't it can point to an ISP problem. I can't find much info at all about your ISP... you should probably give their help desk a call & find out their policy on p2p use. Some ISPs shape bandwidth for p2p apps, which can reduce speeds to a huge degree.

If you find that your ISP are shaping your bandwidth, you could try changing to a higher port (try one in the range of 49152 - 65535). There's no guarantee that it'll work though! If you did decide to change to a higher port, you'd also have to change any port numbers allowed through software firewalls & also any ports forwarded through a modem/router.
(to change LW's listening port tools > options > advanced > firewall config. Apply to save any changes)