File copy slow, extremely slow

Hi everybody,
I'm facing a strange situation where file copy from an external drive (USB) to my hard drive (a macbook pro late 2008) is extremely slow.
I'm trying to understand what is happening and got here to get some help from experts ^^
The problem arises on some files only and is not specific to the external hard drive I use.
Once a file start to copy slowly, cancel the copy and start it again does not help. It's like the system finds it hard to copy this file.
It is generally very large file (over 5Gb).
I've used the disk utility to check the hard drive but every thing is ok.
I'm currently trying to copy a 35Gb file. The ETC is 74 hours !!!
Can somebody help?
Thanks
Pascal

Thanks Chris for your answer.
I did rest the PRAM but it does not help. I just tried to copy the same file and the ETC is 305 hours
An other idea?
Pascal

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