can't get access to the vault with administration tool

While trying to get access, after entering login & pass, an error window "An attempt was made to access a record in the database that is locked by another user ..."

I'm under W7 x64, and the same vault opens perfectly on other platform such as XP x32 (the deals with other platforms I didn't know)

SolidworksSolidworks Pdm enterprise Pdm