failed windows 98 instalation

 my freind just gave me a notebook computer on which he tried to install win 98, it had win 95 previously. something failed during the install and no matter how many reboots i've tried it just will not go. i've tried to reinstall win 95 (he kept win 98 so he can ruin another perfectly decent notebook) but there seems to be some
problem between the win 98 and the win 95. basicly i need the dos comands that allow me to clean out win 98 completely so i can start fresh with win 95. the note book has a cd rom if there is a program i can burn out
there. i will settle for the dos comands i need to do this.
also if there is some partitioning i need to do that info would also be helpful. thanks to all who take on this near lost cause.

How to install Microsoft Windows 98