Do you have access to your old computer to get that resume from it?
If you do not and need to recreate one then you would want to use a word processing type of program. Microsoft Word does cost but there are free alternatives such as Google Docs or Open Office, if you Google "Microsoft word alternatives" there are a lot of articles that run down some good free options. Once you've created your resume in a word processor you can convert that file to a PDF to send out.
Thanks,
Josh