How to prepare for software tester entry level position

Hi,
I applied for a entry level tester position for a company which develops anti virus for apple products( mac, ipad, iphone).This is my first interview so can any one help me how to prepare for this type of company interview like what kind of questions they can ask what will any one expect to test for anti virus software.
what kind of testings will they do , what testing methods should i prepare for
please provide as much information as you can ,ity will be very helpful for me to prepare for the interview.