No surprises...
I used to work in that very store, to my shame. I needed the money, OK?
I have no idea who the current manager is, as this was a while ago, but the ethic was always "of you can find a way out of actually helping anyone and costing us money, do it". I would, however, like to say that a small number of the staff didn't follow this rule and actually tried to make life easier for customer. They were, however, in the minority.
fixit_f is partly correct - the sales staff do make crap up if they don't know the answers. I'd hasten to point out I worked in sales and never did this - and again know others the same. But I do know that the majority did. Worse, they would make up any old crap if it made it more likely you'd buy something.
One example was a particularly evil and greedy salesperson who went as far as promising a customer that a portable floppy drive for the new iMac (the first generation of them) would be released within 2 weeks. In time for the customer's daughter arriving at university so she could transfer files. Of course, such an item wasn't even on Apple's "to do" list...
PC World is a load of sh*t (can I say that? If not, just slice this line out) from personal experience working there and as a customer. The thing is, they're huge, they're a brand and we're stuck with them as people will always troop to the big handy shop on the retail park.