I find Vista generally more stable, and faster (on the right hardware) than XP. IE7, love it or hate it, does appear more stable than IE6.
In this case, I suspect Loo-knee had downloaded an activex component that was crashing IE all the time (activex misbehaving is IE's achilles heel).
As for those proposing Linux, although Linux has a place (though not as Joe Public's desktop. Or as a server. Or anywhere really!), I think Loo-knee, no disrespect, would have a whole heap of trouble with it.
For those proposing Firefox - yup, not a bad browser, probably the 'best of the rest' overall, use it if you prefer it. Just be aware it has more bugs than MI5, and because of its popularity now, is a target. 18% of hits to OOF are FF, though sadly, 4% of those are running old, vulnerable versions.