I'm trying to load these games on windows XP and it's not working. It was made for windows 98.
Is there something I can do to make it work?

Do you receive an error message when attempting to load them?

You probably need to use DOSBox for the DOS games:

http://dfendreloaded.sourceforge.net/

For the Win95/98 games, you can use compatibility mode:

Windows XP:
http://www.microsoft.com/windowsxp/using/helpandsupport/learnmore/appcompat.mspx

Windows Vista:
http://windows.microsoft.com/en-US/windows-vista/Make-older-programs-run-in-this-version-of-Windows

Windows 7:
http://windows.microsoft.com/en-US/windows7/What-is-program-compatibility