My steam is absolutely refusing to open on my computer, any idea why, or any help?

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My steam is absolutely refusing to open on my computer, any idea why, or any help?
tumblr pls. I need some help with my French homework.
I'm trying to correct my French exam aaand I got this problem wrong and I don't understand why...
I need to write the word in parenthesis in the past tense with the correct helping verb...
J'/je ___________ les escaliers en courant. (descendre)
I wrote: Je suis descendu les escaliers en courant.
Correct answer: J'ai descendu les escaliers en courant.
Why do I use avoir and not être?