I broke it!

I have been using an Ad rotator widget that has been working out great. Unfortunately, i put some java code instead of html in one of the boxes unwittingly, and not only did the box no longer work, now the little drop downs that ask me how many text boxes, how many category widgets, etc do I want it gone.

I uninstalled the widget and deleted the files and downloaded anew (ad rotater) but when i uploaded it again it still mentioned the error.

How do I cut my losses, get my ability to add more text boxes, etc again.

I am really frustrated and don’t know what to do. I can’t even just delete what i wrote in that one widget. it says there is an error on a line but you think deleting that widget would solve it but i still can’t get my ability to select a number of text boxes, etc back