Posts Tagged ‘windows’

Fix Broken Windows Boot After Installing Linux (grub)

Monday, October 8th, 2012

When you install Linux or another OS alongside Windows in a dual-boot configuration, the installation often sets up a boot loader like grub to manage the booting alternatives. This can sometimes break the Windows boot loader, which can cause problems in certain situations.

One situation is where you have a Windows hard drive and a Linux hard drive. It works fine as long as both drives are installed, but say you remove the Linux hard drive: you would expect the Windows drive to boot up straight into Windows. But instead you might get a message like “BOOTMGR is missing”.

Another situation that I ran into was that I could not upgrade Windows 7 to SP1 in my dual-boot configuration.  Reasons why are discussed here.  I had to revert the boot loader back to booting directly into Windows before the Windows 7 SP1 update would stick.

There are also a few other situations that might cause your Windows boot loader to get corrupted, and you probably don’t want to resort to restoring your entire drive from a backup image or re-installing Windows from the ground up.  So here’s one relatively easy way to fix your boot.

Repairing the Windows boot loader

Here is one way to repair the Windows boot:  Find a Windows Full or Upgrade install disc. Boot from it. When it comes up, select your language, then at the next screen, select the Repair Windows option at the bottom of the screen. Select the Startup Repair. Indicate which version of Windows you would like to repair, if it finds more than one installation on your hard drive. It will do some checking, and should find that your BootMgr is in need of repair. Tell it to repair the problem. After that it should boot directly into Windows again.

This works with a Windows 7 Upgrade disc.  I’m not sure about Windows XP.

Setting up Cygwin

Wednesday, September 19th, 2012

CygwinThis is my procedure for installing Cygwin on a Windows desktop. There are many ways to configure the Cygwin environment. This seems to work for me:

  1. Go to
  2. Download the Cygwin installer/updater to your desktop
    1. Choose setup_x86.exe (32-bit installation), or
    2. Choose setup_x86-64.exe (64-bit installation)
  3. Run it

Use the following settings to answer the setup questions:

Root dir:  c:\cygwin  (for 32-bit; or c:\cygwin64 for the 64-bit install)
Install for:  All users
Default file type:  DOS
Package dir:  c:\cygwin_install (recommended; can be deleted later)

Be sure to install the following packages:

Section  Package
------- -------
Net     inetutils
Net     ncftp
Net     openssh
Net     ping
Python  python
Python  python-imaging
Python  python-tkinter
Shells  chere
Shells  mintty
Shells  tcsh
Shells  xterm (for resize)
Utils   ncurses (for tset)
Web     wget

Set the HOME environment variable in Windows (Computer->Properties->Advanced->Environment Variables) (put your username instead of username):

Win XP:
HOME  c:\Documents and Settings\username
Win Vista/7/8:
HOME  c:\Users\username

Optional environment variables:

$OSG_HOME (OpenSceneGraph)

Set the PATH environment variable. Cygwin will inherit the Windows PATH, but you need to add the directories containing the Cygwin executables. This is a very minimal .cshrc file. You will probably want to add a more sophisticated one. I have a small set of “dot” files that I copy into a user’s HOME directory when setting up Cygwin. To create the minimal .cshrc file, type the following lines at a shell prompt, ending with the <Ctrl-D> (Cygwin EOF) character:

/usr/bin/cat > $HOME/.cshrc
set path=(/usr/local/bin /usr/bin /bin $path)
setenv CYGWIN nodosfilewarning

Run the following commands (put your username instead of username):

Win XP:
/usr/bin/mkdir /home
cd /home
/usr/bin/ln -s /cygdrive/c/Documents\ and\ Settings/username/My\ Documents username
Win Vista/7:
/usr/bin/mkdir /home
cd /home
/usr/bin/ln -s /cygdrive/c/Users/username username


mintty shortcut:

C:\cygwin\bin\mintty.exe -i /Cygwin-Terminal.ico /bin/tcsh

Create ~/.Xdefaults containing the following:

rxvt.scrollBar_right: True
rxvt.visualBell: True
rxvt.cursorColor: red
rxvt.saveLines: 5000
rxvt.geometry: 80x40
rxvt.font: courier
rxvt.foreground: black
rxvt.background: white
xterm.scrollBar_right: True
xterm.visualBell: True
xterm.cursorColor: red
xterm.saveLines: 5000
xterm.geometry: 80x40
xterm.font: Consolas
xterm.foreground: black
xterm.background: white

Put mintty in the Windows Explorer folder right-mouse menu:

Run the following command to create a Windows Explorer context menu entry:

/usr/bin/chere -if -t mintty -s tcsh -e "Cygwin Terminal Here" -o "-i /Cygwin-Terminal.ico"

If you get an error like this:

Error (5): Access is denied.
/usr/bin/chere Error: Hive not writable
/usr/bin/chere: Aborting.

it is a UAC (permissions) problem.  Launch the shell as Administrator and try it again.

Modify /etc/csh.login as follows, to let the shell run by chere start in the proper directory:
Replace the last line:



if ( ! ${?CHERE_INVOKING} ) then