The average Walmart customer is not going to be your average Tom's reader. Just think about all those tech-support calls you always heard about: unplugged computers not turning on, CD-drives as cupholders, slipping CD's/floppys into the vent slots on the computer/monitor, etc.. etc... This is clearly your average Walmart customer, and the type of person they are catering this service to.
I also don't think the people offering this support will be anything other than average employees who volunteered to take the week-long training in exchange for 5 extra minutes of break time every other tuesday. Think more along the lines of a call center employee.
+"Hello, whats your problem?"
-"Help!! My computer is on fire."
+"Ok sir, please don't panic, have you tried resetting windows?" -"What? Its on fire, how would that help?"
+"Please sir, try restarting, I'll wait on the line..."
-"No, that didn't help."
+"Ok sir, you may have a corrupted registry, do you have the rescue CD that came with your computer, we're going to try to reinstall windows."
-"I really don't think that will help, isn't there something else I can try?"
+"Sir, until we've eliminated any Windows issues, I'm not authorized to issue a service ticket."
-"Well, I don't think I have the CD, but it doesn't matter anyway, the fire has melted my CD drive."
+"Oh, I'm sorry sir, but physical damage to your computer is not covered under your warranty. If you would like to purchase a replacement CD drive, I can connect you to our sales department."
-"*click*"