Hi,
Firstly, When you phone has finally started go to this link and download, install and run Malwarebytes Anti-Malware Mobile.
https://play.google.com/store/apps/details?id=org.malwarebytes.antimalware&hl=en
also if you have no anti virus installed you may wish to download, install and run Avast Mobile Security and Anti Virus.
https://play.google.com/store/apps/details?id=com.avast.android.mobilesecurity&hl=en
If they both pass with no problems reported, then back up all your data. Scroll to p53 in this link
https://www.manualowl.com/m/Huawei/Ascend-Y600/Manual/425449?page=1
and perform a hard reset to rectify your problem.
http://www.hard-reset.com/huawei-ascend-y600-hard-reset.html
''Warning:You will lose all your data and settings when you perform a hard reset that is why it is important to back up your data''