This is a regular headache for us NETs - over the vacation, a computer's been replaced or upgraded and you have to go through the whole process of converting everything back to English, or re-learning where all the good buttons are and how to avoid the bad ones. Asking the school techie helps little - ours tried really hard and worked for hours but in the end just gave us mouse-hover English labels for the buttons. Not being able to see your options at a glance slows you down and makes your job harder than it needs to be.
Have no fear! You can change your software to English in under 15 minutes.
Head over here and follow the instructions.
There. Did I make your day?
Here's a direct link in case the one above isn't working.