I live in the US. It's great right now because comparatively we have a lot more freedom than some countries. Also, the standard of living and median salaries are pretty good. However, I think that we are starting to decline. The war in Iraq is a huge drain on the country and the Euro is hurting the dollar. So 8/10 but we're going down.
Both are fine, but I use WinAce and it works nicely. Also, it's very easy to use. The free trial version you can get online can be used forever, although it will keep asking you to register you don't have to. Between Winrar and Winzip I'd prefer Winzip, but it stops working after 30 days...
I'd suggest using Win Ace, it's free. But if you can't extract any of them the file is probably corrupted. If you download WinAce you can open the file automatically, I'd try that.