I have remembered the one I wanted. Tree Size Free at http://www.jam-software.com/treesize_free/. It is an excellent program which helps to analyse the disk space also as pie charts etc. Karen's gives almost too much info.
When all you want is a list, some of those programs go too far and get complicated so I wrote myself a couple of .vbs and .bat files for various options to make a list of folders and files that are then saved to a txt file. (I got the info on howto via google searches)
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