First ,
I don't know if you can reset a user's screen resolution without some SERIOUS API calls...(See J-Walk's tip on reading resolution and setting ZOOM accordingly...) - it would take Ivan to figure out the rest!
Second, let the "Low-Res" user scroll a lot...Until they learn better...Just don't take away their scroll bars!
As Ivan said, it's 5% (of his viewers right)? Ivan's is a pretty heavily visited site, so from a demographic/"survey says" standpoint, I'd stick with his numbers...
Or buy the "Low-Res" users some bi-focals! Lord knows we'll all need them soon enough!
Smitty