[solved] Launcher stopped unexpectedly

Hi guys yesterday i was experiencing with the same problem on my android smartphone , i did every thing like factory reset the phone and installed new launcher  . Factory resetting solved it but not for long time , after few minutes it again gave the error . Then i installed another launcher from app quickly before crashing , and started using my phone but then the dialer gave the same error " unfortunately contacts stopped " then i tried using third party app as a dialer but how long i can use my phone like this , then i did a wipe/factory reset from the safe mode and this worked now it is about to be two days my phone is working perfectly fine . May be that was due to any kind of malware that was entered due to installing apps from other than market .