What should I study for my PC Specialist interview?

Just know about new hardware that's out and coming out i feel would be key questions. How to remove viruses just the basics that a dumb customer would ask
 
New hardware - yes.

But also play "devil's advocate".

Write down the top 5 or 10 questions you would be nervous about being asked. Your own weak points so to speak.

Then find/learn the answers.