You've not stated which version of Word you've used. You might have installed a version that's not compatible with XP.
Suggestions:
1. Try a different word-processing program, with the most obvious choice being OpenOffice Writer (which is part of the full OpenOffice suite):
https://www.openoffice.org/
2. Try a DTP program, with the easiest to use freebie probably being Serif PagePlus SE:
http://www.serif.com/desktop-publishing-software/?mc=FSSPAGEPLUS
and the top-of-the range (full professional quality) freebie being Scribus:
https://www.scribus.net/
3. Design your business cards online, using the Avery website and print them directly from there:
http://www.avery.co.uk/avery/en_gb/Demos/Software-Demos/How-to-use-Avery-Design-and-Print-Online.htm
(For 5 rows and 2 columns of business cards, the Avery A4 sheet number is C32070, which you can use even if you're actually printing onto a different brand)