I recently found and performed a patch on my Windows ME OS in order to reacquire real DOS ability within Windows ME. I would like to have the ability to reverse the change and supposedly it should have been easy to do, but thus far, I've been unsuccessful. The patch procedure was basically as follows: -Create 2 folders on the C: drive called Temp and DOS Storage -Download a file Real_DOS.zip, unzip the file and place incl files in Temp folder -Copy original Win ME files Windows\command.com, Windows\Command\EBD\io.sys, and Windows\System\regenv32.exe into both Temp and DOS Storage folders -Make sure R, H, and S attributes are removed from files in Temp folder -Execute WinMEDOS.exe in Temp folder(was file incl in Real_DOS.zip) to patch io.sys, command.com, and regenv32.exe within Temp folder -Copy newly "patched" files as follows: io.sys to C:\, command.com to both C:\ and C:\Windows, and regenv32.exe to C:\Windows\System -Copy new autoexec.bat and config.sys(incl within Real_DOS.zip)to C:\ -Reboot and presto....... you now have unhidden real-mode DOS in Windows ME I guess I'm just uncomfortable not being able to go back to my original setup, so I decided to try it. The procedure stated it could easily be done since I had saved a copy of the "original" files io.sys, command.com, and regenv32.exe in the folder DOS Storage. All I supposedly had to do was copy the original files from DOS Storage back to their original directories and remove the new autoexec.bat and config.sys from the root C:\. So I copied the original files from DOS Storage as follows: original io.sys to C:\, original command.com to C:\ and C:\Windows, and original regenv32.exe to C:\Windows\system. I also copied my original autoexec.bat and config.sys to C:\. However, when I rebooted, I received the error message: "Invalid system disk.. replace the disk, and then press any key". At this point all I could do was boot using my Win ME boot disk and copy the patched files back per procedure. This allowed me to boot into Windows again. This patch procedure was advertised to be reversible (using the save originals to DOS Storage folder step), but I can't seem to get it to reverse. I guess I'm looking for ideas or for someone to tell me what I might be doing wrong during the patch reversal attempt. Thanks.

when you get the invalid disk error, bootup with a regualr win-me startup disk, and at the a: type sys c: and hit enter, it should respond; system transferred then take out floppy and reboot.

regular win-me startup disk.

www, I tried your suggestion and it worked like a charm! I was a little scared to try the SYS command, but I figured I could probably return to the DOS patch deal if it hadn't worked out. Thank you very much for your assistance.