I tried to paste three values into a worksheet, into cells A1, B1, and C1. By accident I highlighted rows A, B and C before I pasted. That caused the values to be repeated throughout the rows, as far as excel would go. Then I saved the file, also by accident. Now my worksheet has thousands of columns I can scroll through, even though I deleted all those new columns. This is making all procedures in this worksheet very slow. Does anybody know how I can reset the number of columns to the default setting? I don't want to restrict what can be scrolled, I want to reset.