One new point: i uninstalled xampp and OCS then in installed them again. As i start Apache and mysql manually (with start in control panel) it seems to work ("running" is displayed). I'm granted to admin apache and mysql so it's ok.
So i tried to use OCS and i have access to the main menu. but when i try to send a configuration from another computer to the server (with OCSinventory.exe /server:@server /PNUM:80), informations are not imported, it's as if the database doesn't work.
This time when i check the ports, the right applications are ok: 80 is associated with httpd.exe and 3306 with mysqld.exe...but sometimes they are not associated and "Unknown" is displayed!
But when i try to check "SVC" in control panel, apache doesn't start any more even if i uncheck SVC and try again to start it manually!!