I don't want to do this for ever, but would like to get some IT Experience on my resume. So far I have earned a CCNA, and a CCENT.
What material do I need to look over to better be prepared in case I get a help desk phone interview. I can definitely have a conversation about the networking, but if you start asking about Windows 7 or anything non network, I would have to look it up

? I understand each help desk position will require something different.
I do build custom computers for myself, but nothing more.
IS there a Windows7 and 8 Certification

?
MY Background
Customer Service/Technical Support Agent