Theme (or code) has gone terribly wrong….

My theme went seriously funky last night. All I did was put up a java widget, then things went badly. I removed the widget and now, no matter what I try, my theme won’t revert back to “normal”. I’ve deleted the theme, redownloaded it, reinstalled it. No difference. I’ve tried other themes out all morning, but I have the same problems in the same areas, so it has to be something with WP or the code, which I haven’t touched. The appearance is messed up, specifically at the top, where the search box is (was in the lower sidebar, but has, weirdly, been shoved to the left), in the lower sidebar (formatting is missing), and the bottom (also shoved to the left.

Any help is greatly appreciated. This is very frustrating. I’m NOT qualified to comb through code or css or whatever. I am not a techie, so please speak in plain english….and slowly ??

Thank you in advance for any suggestions.
– Rachel