I am using nokia E72 and facing the problem that if i take phone's battery out then put it again and try to switch it on then the screen remain blank (screen stay white) and i will have to switch it on again.

Now very first i got it repaired from nokia care in gurgaon. They reinstalled software and their response was very good. But in the evening only, the same problem occurred and i went to nokia care in noida but it was like visiting some govt. Office. As per them they have replaced my phone's display but, they also denied me to insert the memory card and suggested me to buy new one. Now my questions are :

1) Why there is no antivirus provided with nokia business series? Even not a trial version?
2) How can a virus damage display by this way that they required to change my display?
3) If memory card is having virus then why is that useless? And if it so then the phone is also useless because it was also having virus as per them.
4) i said noida office as govt. Office because i was not having any updates about my phone and ultimately i had to query them twice about it and it took more than 24hrs for them to repair it. Other companies give a backup phone to customer (atleast for business phone) incase it takes time for them to repair.
5) It is actually worth to buy Nokia these days?

Regards,
Peeyush Nagpal