Why is that the least of my worries then?
Like I said, Bethesda (in their infinite wisdom) decided to offload some of the graphics engine work to the CPU. Your CPU is pretty old as it is and four cores is the standard nowadays with truly multi-threaded games being the norm for recent releases. I can't imagine Skyrim running exceptionally well, even with a GTX 500 series (which is no doubt being bottlenecked by that CPU).
Ever think it's not Steam that is the problem, but the mandatory install of Steam? Some people don't like giving up their freedom and control over stuff they own, strange thing, right? It' not even Steam, really, it's the having to have internet thing, that's just completely absurd.
Probably best that you get used to it now or buy a console, games have been going digital or coming with some form of online anti-piracy checks for years now. It's not ideal, but Steam is certainly the least malevolent form of it considering how many features it offers for absolutely free, actually useful features too.
Ummm... uh huh... so... needing the Internet for antivirus updates to protect yourself must also be absurd, at least according to this logic.
Your particular comparison made me laugh because the kinds of people who love to bash Steam and dismiss it without so much as trying it are probably the sorts of impudent smart asses who "know better" than to need antivirus.