Default Alcatel OT 910 apps crashing

my phone Alcatel OT 910 drives me crazy last times. When i try to enter the recovery mode pressing volume up+home+power on buttons only an android logo exclamation mark appears and nothing else happens. When i try to install an .apk file from phone it wont and i get a error: "process has stopped ..." and it's the same for every application. And even if i go to settings and then applications and when i click on some application to clear cache or to shut it down i also get a message has stopped....

Hwat should i do?