When I open DOS, it says:

Code: [Select]C:\WINDOWS\system32\cmd.com
C:\WINDOWS\SYSTEM32\AUTOEXEC.NT. The system file is not suitable for RUNNING MS-DOS
and Microsoft Windows applications.
Choose 'Close' to terminate the application.
I need it to open!Is autoexec.nt in your system32 folder?Quote

1. Click Start, click Run, type c:\windows\repair, and then click OK.
2. Right-click autoexec.nt, and then click Copy.
3. Click Start, click Run, type c:\windows\system32, and then click OK.
4. Right-click anywhere in that folder, and then click PASTE.
5. Right-click the Autoexect.nt file that you just copied, and then click Properties.
6. Click to select Read-Only, and then click OK.
7. Repeat steps 1 through 6 to copy the Config.nt file.

Quote

1. Click Start, click Run, type c:\windows\repair, and then click OK.
2. Right-click autoexec.nt, and then click Copy.
3. Click Start, click Run, type c:\windows\system32, and then click OK.
4. Right-click anywhere in that folder, and then click Paste.
5. Right-click the Autoexect.nt file that you just copied, and then click Properties.
6. Click to select Read-Only, and then click OK.
7. Repeat steps 1 through 6 to copy the Config.nt file.

http://support.microsoft.com/default.aspx?scid=kb;en-us;324767