Master's in Comp Sci without Comp Sci undergrad?

I recently was accepted into a Comp Sci Master's Degree program at a top 10 school, which is great, because it is a very sought after program right now. However, my undergrad was MIS and I've spent the majority of my professional career (~8 years) in a sys admin / engineer type role. That being the case, I have a very limited programming background with only cursory experience in a few languages.

So I'm kind of torn at the moment, part of me wants to give it a go and maybe take one course at a time, while learning on the fly. While, another part of me thinks that I might be fighting a losing battle and wasting time and money.

Any thoughts on how I should proceed?

Thanks in advance