Ahhh, yes, this is most likely your problem. NTFS is known for many many different issues on Linux. Don't use it if you can avoid it. Actually NTFS-write "is still only partially" possible even with the latest kernels ~ to give you an idea about what I'm talking about. A quote from the help file in the latest 2.6.11 kernel: "The only supported operation is overwriting existing files, without changing the file length. No file or directory creation, deletion or renaming is possible".
Of course this applies to writing, not reading.... however is writing is so unstable and limited, imagine how "accurate" reading is
It's possible to download directly to your Linux partition? If so, use this method.
Your disto supports it ... SuSE always add in features like this, so don't worry about it.
Anyway, I think you have found the source of your problems... and one you start using the Linux partitions you should not have this issue any more.