My SAMSUNG mobile phone has faced to a virus attack(I think).It stucks sometimes.And sometimes it restarts automatically.When i connect it to my laptop & browse it's memory card,it shows a file calls "_UnqiueId.dat".I deleted that file.But when i reconnect the phone to laptop,it shows that file again.I think that file is a virus or something like that.Please anybody can help me to overcome this problem?

Unlikely, How long have you had the phone, has it always been a problem?

It's from 2 months.Not always,but sometimes.....