I was posting this as a comment but it's too lengthy to fit, so I'm posting this as an answer. I really don't know if this will do the job, as it's usually used for Windows boot problems and not because of a BSOD.

But since you just can't boot into Windows at all without getting the BSOD, this might be worth a try. (I found these instructions years ago, and don't remember where I got them or whom to credit.) After running this, if it works and you can boot into Windows again, you'll need to boot Ubuntu from a live CD and reinstall Grub.

How to repair and reboot to Windows 7:

1. Insert the Windows 7 System Repair DVD or Installation DVD and reboot.




2. Select the correct keyboard input method and click "Next".

   
   
   

   Note: If you are using the Windows7 Install DVD then at the 'Install Now' prompt (Do not pick the Install Now option) instead choose the 'Repair your computer' option located in the lower left of the dispay.




3. The System Repair tool will search for a valid operating system and will report that "Windows found problems with your computer's startup options. Do you want to apply repairs and restart your computer?"




4. Click "Repair and restart" and reboot again to the Windows 7 System Repair environment.




5. Click "Next" at the keyboard selection prompt and when the "System Recovery Options" screen appears verify that the "Use recovery tools that can help fix problems starting Windows" is selected.
   Note that on your Dual Boot system there now should be only one operating system listed. Click the "Next" button.




6. Now from the menu list select the "Command Prompt" option.




7. At the DOS prompt type the following three commands:

   
   
   

   bootrec.exe  /fixmbr
   
   bootrec.exe  /fixboot (may return an 'Element not found' message)
   
   bootrec.exe  /RebuildBcd
   
   




8. Close the command prompt window and click the "Startup Repair" option.




9. The repair process may take some time, so wait until the process completes at which point you will see two messages "Windows cannot repair this computer automatically" and "Startup Repair cannot repair this computer automatically".

   
   
   

   These messages are the result of the radical changes made by removing the other drive. Ignore the Send/Dont send options.




10. Close this message window by clicking on the X in the upper right corner of the Send/Dont send window. Next click on the "View advanced options for system recovery and support" option and from the main menu once again click "Startup Repair".

    
    
    

    This time the repair process may only that a few seconds and when prompted "Startup Repair could not detect a problem", click "Finish" and run the "Startup Repair" option one more time, click "Finish", and then remove the System Repair DVD and click "Restart". Reboot the computer.