Task Scheduler on remote computer

Hi, I have windows Vista and I would like to have access to the Scheduled Task on remote computer (Windows XP). With windows XP when I browse the network and go on remote computer I can see the Scheduled Task but with Vista that desappeared, it is normal? (I have the administrators privileges) I (Vista) tried also to connect to another computer (Vista) in the Scheduler task, it works fine but when I (Vista) tried to connect to a Windows XP computer in the Scheduler task, a Task scheduler pop up says that I don't have permission to access this computer. Any advices??Thx in advance