try this one it works with 98se and may work with me, though I have'nt tried it with me.
reboot with boot disk in a drive, when asked start pc without cd rom.
at the a/ prompt type in as follows
dont miss the space
you will then be given a choice of files to replace, chose ie
when done you should be able to replace completely your internet files with original files
you will of course have to retype your isp ect,
this apllies to all windows files as far as I remember