Need Help Enlarging Image

Hi Everyone, Thanks for viewing my post!

I am interning for a conference center and am trying to make a good impression here, but ran into a problem with a task that I was assigned to. I have to create a newsletter for the staff and everything looks pretty good except the header.

I have a header that I think would go great with my newsletter, but if I simply enlarge it, it becomes blurry. I do not know who originally created the image, but I am not a Photoshop user (yet) and cannot figure out a way to make it look the same, but bigger.

The header can be found here… http://www.gwcconferences.com … it is the green image at the top that says “The Conference Center George Williams College Aurora University” with the emblem next to it.

It doesn’t need to be huge, the height is okay (if anything just a tiny bit higher). I can always size it down, but the other way is giving me trouble. I would really appreciate anyone’s help on this, but either way, thank you for taking the time to read my issue!