Just wait until it downloads it again. Should be fine.
That was my solution as well... BUT as i have noticed, the re-downloading is adding (again) massive data to C: . I already have a 21gb big blockchain data there and only 4gb left of free space. This won't go far.
![Undecided](https://bitcointalk.org/Smileys/default/undecided.gif)
My second solution would be to save the wallet.bin file and then erase everything and re-install a new client. But this will take days - so i wait, maybe somebody has a better solution...?
EDIT: It's done - solution found!