How to: Restore a backup made using MSBACKUP in previous version of DOS.
Solution:
Remove the attributes from Msdos.sys by editing the file to add BootMulti=1. Press F4 when starting the computer to access the previous MS-DOS version.
NOTE: The following procedure will work only if the previous MS-DOS version still exists on the drive. In some cases, the user has elected to remove the previous MS-DOS files prior to setup.
1) Click the 'Start' button to display the 'Start' menu.
2) Select 'Find' and select 'Files or Folders...'. (The 'Find: All Files' dialog box appears.)
3) Select the root directory to search, from the 'Look in' drop-down list box.
EXAMPLE: C:
4) Type MSDOS.SYS in the 'Named' box.
Type MSDOS
5) Click 'Find Now'. (The dialog box expands to show the results of the search.)
6) Right-click the file named Msdos.sys in the find results window. (A pop-up menu appears.)
7) Copy Msdos.sys to a diskette to create a backup:
a) Select 'Send To' from the pop-up menu.
b) Select '3-1/2 Floppy A' or the drive that is listed for the floppy drive.
'Send To'
8) Right-click the Msdos.sys file.
9) Select 'Properties' from the pop-up menu. (The 'MSDOS.SYS Properties' dialog box appears.)
'Properties' from pop-up
10) Click the 'General' tab. (The 'General' tabbed page appears.)
11) Clear the 'Read-only', 'Hidden', and 'Archive' check boxes.
NOTE: This removes the Msdos.sys default attributes and enables the file to be edited.
Remove attributes
12) Click 'Apply'.
13) Click 'OK'.
14) Select the Msdos.sys file from the find results window.
NOTE: The find results window may contain multiple files named MSDOS. The correct file is named Msdos.sys and is a system file.
15) Select the 'File' menu and select 'Open with...'. (The 'Open With' dialog box appears.)
16) Select 'WORDPAD' from the 'Choose program you want to use' list box and click 'OK'. (The Msdos.sys file opens in WordPad.)
Open with 'WordPad'
17) Type the following in the 'Options' group:
BootMulti=1
BootMulti=1
18) Click 'Text Only'. (The 'Save As' dialog box appears.)
19) Click 'Save' and answer 'Yes' to replace the existing file.
20) Click the 'Start' button, select 'Shut Down...', and select the 'Restart the Computer' radio button and click 'Yes'.
21) When the computer starts again, press F4. (A prompt stating that the previous version of MS-DOS is being loaded appears.)
