unable to commit a file ( locked after an update operation )

[LUSSIEZ Eric]

Hello , I'm using winCVS with a repository designed by a local mounted
directory.
I'm alone working on that repository. I modified a file and performed ( for
testing and unusefull as i'm alone  ) an update operation. No major problem
since may local modified file was not replaced.
But when I try to commit that file, there is the error "cvs [commit
aborted]: could not open lock file".
My file is locked : why ?
I read the help that says I should log as an administrator to unlock but
there is no administrator declared on the repository. Should I manage an
administrator profile ? How do I create it ? Could someone help me, please ?