Ending with Windows 3.11 and beginning with Windows NT 4.0, the start-up batch file autoexec.bat was no longer used. This file was to set up drivers and other settings in DOS and earlier versions of Windows, and since NT4.0 and Windows 95 no longer used autoexec.bat or config.sys, they just got in the way of the boot-up process. Now there are two hidden files (IO.SYS and MSDOS.SYS) that perform somewhat the same functions for setting up Windows. I suggest you delete, or even better, rename autoexec.bat and config.sys, as follows: In "My Computer" open drive C:. You should at least see autoexec.bat, and maybe config.sys. Here is an example of renaming the file(s): right click on the icon for autoexec. Select "Rename" in the popup menu (from right-clicking). Then just rename the file autoexec.000 or similar. Do the same with config.sys if it exists. Now your PC will not "see" these startup files anymore, and should start up just fine.