Downloads/file transfers freezing?

[Methodz]

First of all, if this isn't the right forum for this question I'm sorry.

Anyway, onto the problem. Over the past 1 month-ish, any time I try to download a file or send/receive a file from someone on AIM or MSN, the transfer freezes. I haven't changed anything or got any new programs, this just randomly started happening. I used to be able to transfer/download files all the time, but then out of nowhere they started freezing and I'm not sure why. Any help or suggestions are appreciated, thank you.