A quick look shows me it is in the language files.
I have iso-8859-1 for version 7.5.6
If you have a backup from your older version you probably will find it is like utf-8
Thanks very much your quick replies - that absolutely worked! My old files were set to utf-8, and setting the new one to utf-8 solved it.
Regarding 7.1. Actually I have 7.5.7.
What I said was "I installed version 7 [period][new sentence] I then imported my data..."