When i turn on my n73 it's show a installing sign then it's say untusted software go to app manager, but i can't open anything like games ect, will i have to unistall everything because i don't know what software is causing this problem? Thanks.
Can't open any software
Try look to application manager and see which one is the problem. If not that way, the other way, is an hard way, try one by one of all software inside.
My guess is that you have updated your phone firmware (and lost phone memory data about installed apps), and the phone detects an app on the memory card (which you haven't formatted, but still has apps you installed before the firmware update) and tries to install it (and fails for some reason or another).
A way to clear the situation is to reformat the memory card.
Or you can connect the phone to a PC using USB mass storage (Data transfer) mode, and then delete things under \private on the memory card. If you can run the Applicaiton Manager on the phone, any apps listed without a proper name (like "a1234567"😉 are good candidate directories for deletion under \private.
Well i made a backup off my phone on p.c formatted the memory card but when i try to restore too phone it only gets to 25% and says not wnough room but i have all my pics, music, texts, on there just no apps i'v put on anything i can do here?
When you do i full restore does it only store files, music, pics ect but not applications and what folder are the apps stored in on the memory card? Thnaks.