Hi, Elizabeth:

Here's the official line from Broderbund:

Question: What operating systems will Family Tree Maker run in?
Answer:

Family Tree Maker version 10
Family Tree Maker versions 11 & 10 has been designed for and tested in Windows 98, ME and XP Home Edition. These are the officially supported operating systems for Family Tree Maker versions 10 and 11.

However, we know many customers who successfully use Family Tree Maker in Windows NT, 2000, and XP Professional.

Family Tree Maker version 9
Family Tree Maker version 9 has been designed for and tested in Windows 95, 98, ME and XP Home Edition. These are the officially supported operating systems for Family Tree Maker version 9.

However, we know many customers with who successfully use Family Tree Maker in NT and 2000.

Family Tree Maker versions 7 - 8
Family Tree Maker versions 7 - 8 are designed for and tested in Windows 95 and 98. Those are the officially supported operating systems for Family Tree Maker.

I'm using FTM 5(!) on Win98. When I looked at upgrading due to occasional lock-up problems, I was stopped by the price... For sheer versatility I highly recommend Personal Ancestral File which allows you to totally customize what goes into a gedcom, and is available free of charge from FamilySearch.org. I do data entry in FTM and use PAF to manipulate files.

By the way, another possibility to try would be the Windows XP Compatibility Wizard. Broderbund tip here: http://support.broderbund.com/techtips_detail.asp?id=94

Hope this helps,
BB