i'v downloaded a tv series,paid for it, its in my itunes but with exclamation marks next to it, every time it tries to download the series it says "part of the file seems to be corrupted" and tells me to redownload it.Tried that and it comes up the same.

Clear the contents of ...iTunes\iTunes Media\Download and try one more time.

If the problem recurs use the "report a problem" links in your account history and explain what has happened so far. There may be a problem with the source rather than your download of it.

tt2

Yes, I meant delete. Your ...iTunes\iTunes Media\Download folder should be empty except when iTunes is actively downloading a file. If there is anything in there now it could be interfering with your download. Delete the Download folder, or its contents, and try again.

tt2

Try this: iTunes: Advanced iTunes Store troubleshooting.

tt2