White screen with ' NOKIA' written on switching on

h installed Disinfector antivirus for accouple of days and to day i tried to update it in my n70 through the internet and igot warnning message that says that i shoud purchaise the prodouct and then shpw me alinke so i can install and replace the editoin and i replaced the edition of the antivirse whith the new one which the gave me and i recived awrnig message says menu erorr after that when ever i want to go to the menu it takes several mintuse and longer time than usuly so i deleted the antivirus and the speed got back but there was another problem after while which is that the phone re started it self and ther is only white screen with nokia nothing else i tried to start it but these is still wite falsh and nokia. h installed Disinfector antivirus for accouple of days and to day i tried to update it in my n70 through the internet and igot warnning message that says that i shoud purchaise the prodouct and then shpw me alinke so i can install and replace the editoin and i replaced the edition of the antivirse whith the new one which the gave me and i recived awrnig message says menu erorr after that when ever i want to go to the menu it takes several mintuse and longer time than usuly so i deleted the antivirus and the speed got back but there was another problem after while which is that the phone re started it self and ther is only white screen with nokia nothing else i tried to start it but these is still wite falsh and nokia.