Importing contacts to Outlook

I am trying to import a large Excel 97-2003 spreadsheet of nearly 1,000
contacts from my previous job into Outlook at my new job. During the process
I am getting a message stating that there are No Named Ranges. I don't know
what this means? At the top of the file, for each column, there are
identifiers, such as first name, last name, company, job title, business
phone, etc. I've tried saving the spreadsheet as a tab delimited and comma
delimited file to see if that made a difference. I got a little farther with
those than the No Named Ranges error message. But after it appeared the files
were importing, Outlook shut down, asked me to send an error report to
Microsoft, then restarted. I would appreciate any help. Thank you.