Thank you very much for your great help! Everything is okay now!
I have read the tutorial and even tried to rebuild, but I linked my code with another configuration (not debug static) and it didn't work.
First, the way described by dabo didn't work either, I got the error mt.exe : general error c101008a: Failed to save the updated manifest to the file. I googled and found out I would have to rebuild the whole solution to suceed, which worked.
I am really glad you could help me, I am looking forward to use SFML, thanks a lot!