really, if the software was designed only for windows 98, chances are it wont install on XP, what you can do is try running the install in compatability mode. to do this:
find the setup.exe or whatever setup file is on the cd,
right click on it and chose properties. There should be a tab at the top or something for compatability mode, chose windows 98 from the drop down menu. hit ok and try installing.
If that still does not work, your only chance is to go to the website of the software manufacturer and check for XP compatible software.
\"Only two things are infinite, the universe and human stupidity, and I\'m not sure about the former.\"- Albert Einstein (1879-1955)