error0327

sore to write in English but my keypord not have a Arabic keys soo my problem is the pocket pc mio 338 it have windows mobile 2002 and for some reason i cant install programs at all i rest the pocket but that not help it say ""****is not a valid pocket pc application" but it is soo i dont know what to do maybe remove the system at all and re install i read the install of WM5 but i cant install the unlock rom program soo is there any why to back these pocket to life it is work great but i cant install any think i tray to install one of the linux systems but non of the versions is for mio 338 soo if any one can help me with that i am vary greatfull and thanks