Why do I get the error code 5105 when trying to redownload a tv episode?

I have lost a tv episode that I had already downloaded to iTunes. I went to download it again and I got the error code 5105. what does this mean and what an I do to get the episode back? I have done everything that the support website said to do but nothing works. I am starting to really think that Apple is going rotten and I need to switch to Samsung. I am running a windows computer with Windows 7.