CAn anyone identify it for me? I've already tried What the font, and they couldn't tell what it was. (The automated app, I haven't asked this before.)

Trebuchet  Suggested by SashiX 

Do you have a link to that web?

Yeah, here it is, the font in question is on the bottom right and the bottom left, in two different sections, it's only used for the header though.

http://www.lumosity.com/

Just what I thought (and it's already on your PC)

OMG, I feel retarded now. Well, thanks man.