Everyone who has an inclination to mess about with their Windows setup should ALWAYS make certain they have a full backup before doing anything they might regret later or, indeed, doing anything at all, just in case.
You have mis-typed (or the title has been truncated because it is too long) your operating system. I guess it is a version of Windows that uses AUTOEXEC.BAT and CONFIG.SYS. Is this where you have been messing? Some older versions of Windows required the command WIN to be included in the AUTOEXEC.BAT file.
As one who has done the same sort of thing too many times over the years......
98 is much more secretive than Windows 3.x and I can only suggest trying a restoration of the Registry. If you've never done this then reboot and keep tapping F8 while it boots and before it makes any attempt to load Windows.
A DOS screen should arrive and offer a variety of things - choose "Command Prompt Only"
Enter and at the C:> prompt, type - scanreg /restore - making sure you leave a space between scanreg and /restore.
Press enter and follow the prompts choosing a date before it all went pearshaped. This might clear your trouble but it only restores the registry not the whole system.