• First, as always, make sure you save your work frequently.
• Second, try the suggestion here and your problem should be solved.
  

How To Open CodeBlocks and Create a C++ File

Getting Started in Code::Blocks

• Search for the Code::Blocks Icon on the desktop and double-click. If you can't locate it on the desktop, look under the Start Menu for Windows or in your Applications folder on the Mac.  

• Code::Blocks should open and display the following start screen:

• Click on File in the top menu. Hover over New. Hover over File... and select it.
  

• Select C/C++ source file from the options.

• A popup up will appear welcoming you to the file wizard. Click next.

• You will have a choice between creating a C file and a C++ file. Choose C++ and click the Next button:

• Now it is time to choose where to save your file. Click on the box located next to the "Filename with full path:" text box, as shown below:

• You will now have a choice as to where to save your file and what to name it. Make sure to give your file a name with the extension .cpp (For example hello.cpp). You may wish to create a separate folder to save all C++ files for this class.

• Press the save button and you will be ready to start coding!