Sounds like the .csv file does not have the end of record marker set
correctly. Try opening the file in Notepad or Word to see if there is
anything you can use to do a Find & Replace with - assuming you don't
have commas within the data, you could replace comma with comma plus
Line-break (Hard Return). This will effectively give you a single
column sheet when you import it into Excel, but you can recover it more
easily from there.

Pete