the problem is i forgot my password. Have i chance to use my Bitcoins ?
Please, write everything that you remember about your password on a piece of paper. This may help you hack your password.If you make a small mistake in your password, it is possible to "hack", try various passwords. For example you remember abc000 but not know the numbers.
A hack program can try all possible numbers, abc123 .... abc456 ...
When wallet password is forgotten, wallet without password can be still on your computer. Contact expert about this recovery method.I'd be carefull when contacting experts tough... I've seen a couple of scam accusations against "wallet crackers". Always realise that when you send your encrypted wallet.dat AND give such a cracker tips about what your password might have been, he'll have full controll over all your funds if he succeeds in cracking your password!!! This means that he can say he wasn't able to crack your wallet, and steal all your funds a couple weeks later, claiming somebody else must have done it.
I'd personally try to crack the wallet.dat myself... There are a couple of tools out there to do this. A quick google resulted in this one:
https://github.com/glv2/bruteforce-walletIf you create a dictionary using a scripting language, substituting letters in your common passwords, it should be doable.
IF you send your wallet.dat plus tips about the password to somebody, please make sure they have at least green (positive) trust, using an escrow is not good enough (the cracker can put enough funds in escrow to cover the funds in your wallet, crack the password, claim it didn't work, ask his money back from the escrow, and run with your funds as soon as the escrow refunds him)