Show Image
It's impossible to tell definitively from that blurry photo (even the zoomed-huge click-through version is blurry), but that looks like it's mostly
Segoe, Microsoft's variant of the venerable Frutiger. The numbers are definitely not Frutiger, since the numeral 1 doesn't have serifs in Frutiger.
If you need to know exactly, see if you can find some really, really high quality pics of all the keys.
If you just like the overall look to design your own keys (e.g. via WASD), look at the following fonts:
- Segoe UI (pre-Windows 8 versions; the Win 8 version is yucky)
- Frutiger
- Myriad