Gemma,
I'm no techie either but that I can do. Open your walkthrough, minimize it to the taskbar, then open your game. When you want to consult the walkthrough, hit the ALT key and the TAB key. That will minimize the game to the taskbar. Bring your walkthrough up and consult it. Then when you're ready to play again, just bring the game back by clicking on that taskbar icon.
Hope that's clear,
Gil.
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My scythe... I like to keep it close to where my heart used to be.