I mean no offense, but a trained monkey can work in a call center. A bunch of my friends took summer jobs at a Verizon call center every summer when we were in high school, and not one of them knew anything at all about computers.
They're going to put you through a couple weeks of training which will teach you everything you need to know. Actual skill with computers is unnecessary. Call centers typically have very high turnover, so they'll hire just about anyone who puts in a resume.