|What do you mean 'while rebooting. . .'? Does it work OK from a cold boot? Is this a new install of 98? If so, what kind of hardware are you installing it on--hard drive size, ram, cpu?|
Otherwise, if it was working OK previously with no changes, that message usually means the OS is corrupted, perhaps due to a damaged hard drive. Or the drive is not properly identified in cmos/bios setup.