Ok would you please tell me how to export the private key to my address?
I really need that which better than to get a drive and install again the program wait syncing ... etc :3
Open up Bitcoin Core, and click Help > debug window.
Open the console tab.
Type
dumpprivkey
with being the address you received the Bitcoin with.
Copy the string and go to whatever wallet you want and import it there. I recommend using Multibit.
If your wallet has a password, before typing "dumpprivkey", type this:
walletpassphrase 600
where is the passphrase to unlock your wallet. You will have 600 seconds to complete "dumpprivkey"
After you are done, type
walletlock