Cant sync the phones memory

[Guest Berni8k]

One day i wanted do download an app and i went to my computer and mobile deivces and i got a error mesege:

Critical communications services have failed to start.Try resetting the mobile device, and then conect agen.

AcitveSync on the phone says its conected and so dose on the PC.Also windows media player can see the phones memory.

Rebooting the PC and phone didnt work.

How do you do an hard reset? I forgot.Or is it somthing else.

btw:

Its an MPx200 runing WM2003.