The software should run on Win95 with no problems and definitely on Win98.

It might be more useful if you give us some information:

how old is your computer and how big is the harddrive. How much free space in on the harddrive.

Have you run the utilities to free up space on the computer, i.e. have you defragmented it? or used someting akin to a Norton program to free up space?

Blow out the cache/history on your internet program, delete unused games or songs, and clean up your email trash bins.

you could also uninstall programs you don't use and/or components of windows you don't use, i.e. the accessibilty options, online services, desktop themes, multilanguage support ...