After going to my box of homebrew stuff I just just discovered that I have a tube of white labs yeast any pack of wyeast that were not refrigerated for about a week. Have I ruined my yeast?
Unless it got extremely hot in your house I would think you are ok.
You should definitely make starters at any rate, even more so since the yeast wasn't refrigerated. Better to know that the yeast is viable and that you are pitching at the proper rate.
Think about it, you can buy beer off shelves in the shops and still manage to harvest the yeast from it. It sits in the bottom of the fermenter for weeks and stays healthy.
Stored colder, yeast will last longer, but it doesn't just die if left at room temperature.