How can I force my machine to use only the first processor?

A. If you want to use only one processor of a multiprocessor machine, you can use the numproc boot.ini switch (see What switches can be used in boot.ini? for more information about numproc and other boot.ini switches).

  1. Start a command session (Start, Run, cmd.exe).
  2. Go to the root of the C drive.
  3. Use the following command to modify the boot.ini file so it is not a system file, not hidden, and not read-only:

    C:\> attrib boot.ini -r -s -h
  4. Open the file in Notepad:

    C:\> notepad boot.ini 
  5. Locate the entry that starts the OS and add /numproc=1 to the end. For example,

    multi(0)disk(0)rdisk(0)partition(1)\WINNT="Microsoft Windows 2000
    Professional" /fastdetect /numproc=1
  6. Save the change and exit Notepad.
  7. Use the following command to reset the boot.ini attributes:

    C:\> attrib boot.ini +r +s +h 
Hide comments


  • Allowed HTML tags: <em> <strong> <blockquote> <br> <p>

Plain text

  • No HTML tags allowed.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Lines and paragraphs break automatically.