TF2 doesn't work anymore

[Natan]

last night I played the game with no problems. But left the game to adjust the audio settings. And when I booted the game up again I got this message

Steam - Error

This game is currently unavailable.
Please try again at another time.

It still gives me this message and I don't know what to do. I already tried logging out and back in again and nothing.

[GordonFreeman911]

Restart the computer?

[Natan]

that doesn't work. Obviously I didn't keep my pc on all this time.

[Xendance]

Delete clientregistry.blob

[Natan]

Xendance care to explain why??

[Xendance]

I don't what it does, but works every time I get that stupid error.

[99.vikram]

It forces Steam to check for updates to all your games and the platform itself.

[Xendance]

I don't what it does, but works every time I get that stupid error.

What I was meant to say was:

I don't know what it does ... bla bla bla.

[Forceflow]

Clientregistry.blob = a simple file containing a small registry of what steam games you have, login info, recent auth servers, ...

It gets regenerated when it's not there