Launcher has stopped working?

[jetski]

Just before I went on Holiday, I ran COD and was told it was updating. I let it "update" but didn't have time to run it. Now I am back, the launcher doesn't launch. I get a Steam message box that I think is saying "launching Cliffs of Dover" but it's very quick. After that dialogue box disapears, nothing, not running processes, nothing. Nothing in any logs I can find either. The dates on my files in the game folder look like the last updat did not acutally take.

The common theme seems to be 64bit Operating Syatems. and, yes It was working well before the "update". I will now try to re-install.

Any help wpuld be most welcome.