Restore your orignal Config.sys and Autoexec.bat files. To do so, follow these steps:
1.Restart your computer. Press and hold down the CTRL key until you see the Windows 98 Startup menu.
2.Choose Safe Mode Command Prompt Only from the Startup menu.
3.At the command prompt, type the following lines, pressing ENTER after each line:
ren config.sys config.app
ren config.wos config.sys
ren autoexec.bat autoexec.app
ren autoexec.wos autoexec.bat
4.Restart your computer.