Pretty unclear. It sounds as if CodeBlocks is off screen. Here's a link to bring it on screen.
http://www.howtogeek.com/howto/windows/bring-misplaced-off-screen-windows-back-to-your-desktop-keyboard-trick/
Every time when I open CodeBlocks the task manager shows CodeBlocks running in the second plan.How can I change and back CodeBlocks run normally in my pc?

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