Can't open my account file nor my xac files...

[Coume - Lubox.com]

Hello,
I do not know what happen :(

My GNUCash did not crash, but when I tried to open it today, it told me that my account was lock...
Ok then I ask to open anyway, which make GNUcash to close immediately.
Then I decided to delete the lock files and try to relaunch gnucash... but even wihtout the lock files,it told me that It was locked...
I then asked to create a new account, to try to open the xac file... But even when I try to open whatever xac file I have in my folder, but as soon as I try to open one (or my data file) GNUcash crashed...

Any idea how to solve that? 
Thxs in advance

Regards,
Coume