When you say"i can get to the dos prompt" Do you mean you installed DOS first, or all you can do is get to DOS and not load windows? If you installed DOS, it has size(MB) limitations.
When you copied the files you did this right?:
copy X:\win98\*.* Y:\win98\*.* [x:cd-rom, y:Laptop drive]
* I did it a simple way: I just copyied the disc in its entirity thru windows. Copy Paste.
When you at at DOS type:
See if you have any partitions set up on the drive you dont know about.