It sounds like you're probably applying for an entry or junior level testing position. As with most entry level positions, they're going to be looking more for smart people than experienced people. Knowing the differences between clear box and black box testing is less important than being able to show that your a smart guy who has the qualities that would make a good tester. I'm sure you can guess these (detail oriented, ability to prioritize important vs. non-important bugs, etc.).
Depending on the company, they may ask you some "microsoft" questions. As a linux person it pains me to say this, especially since the questions have really nothing to do with microsoft, but since Microsoft relies so heavily on them compared to other companies, they get the name. Basically, these are logic type questions and testing questions on basic items. For instance, in interviews I've done, I've been asked how I would test a scuba divers watch, an elevator, and one of those cans of bubble mix you buy at the kids' store for like 50 cents. When you answer these questions they are looking for you to brainstorm all the different ways to test these objects. They want to know that you can figure out which things are important and organize the tests by dependence on each other (i.e. before you test that the lights on the elevator buttons work, you should test that there's actually electricity going to it). They may also ask you what kinds of things can be automated and repeated. Anyways, to look up these questions, you can do a google search for microsoft interview questions. If they ask you one of these types of questions, make sure to talk constantly. The purpose of these questions is to see how your mind works, so they want to hear your inner monologue. Don't worry if you say something stupid, it's far better that you say 3 smart things and 1 dumb thing, than nothing at all.
As with any interview, if the interviewer wants to do the talking let them. A lot of people, often management types, like to have people sit and listen to them. You'd be surprised how much the smile and nod routine will please someone with a large enough ego, or deeply routed self-esteem issues (never took a psych course in my life, does it show?). Of course, if you have an interview like that, you should really be asking yourself how much you want the job.
-Venkman
But I realize that it's necessary in order to create a good product.