Probably not. You need at least the setup.exe that does all the work (such as extracting things from the cab-files, putting them in the right place, filling the registry, calling the new hardware wizard).
You're other options are:
- not doing a clean install; you don't give any reason for it
- find a Windows 98 disk on eBay (note: you can get the license keys from the current registry, if the versions agree, but it's a doubtful if it's an OEM version)
Here's the deal. This old box didn't come with a windows disk, only the .cab files on the hard drive. Is it possible to do a clean install with the .cab files? If so, what are the steps involved? If not, what are my other options?