2007 Vauxhall Vectra clutch problem

hi there.
i have a vauxhall vectra and i put in a second hand gearbox and put in new clutch kit,csc slave cylinder,master cylinder and all clutch pipes, i have bleed the system and have no air in system.but when i start the car i cant get in gear,but with car not running it goes in gear ok.i can then start car while in gear and when i lift up clutch it drives.