Angus, I unchecked what you said - didn't change anything. I don't use IE, just tried it when my Firefox went all wonky.
Philly, it went weird right after I rightclicked my desktop and clicked on 'Personalize', then started testing the different Win7 themes to see what they looked like. Didn't see anything I liked so I went into Windowblinds to change to a different skin. Then when I opened Firefox, that's when it wouldn't display properly. I hope a 'restore' will work.
Thanks to both of you for responding!