Yes, I have encountered this issue before. Here are some steps you can try to delete the extra rows and columns in Excel 2007:

1. First, make sure that you have selected the entire row or column that you want to delete. You can do this by clicking on the row or column header (the letter or number on the left or top of the spreadsheet).
2. Once you have selected the row or column, right-click on the header and choose "Delete" from the drop-down menu. Alternatively, you can also use the "Delete" key on your keyboard.
3. If the above steps do not work, it is possible that the extra rows and columns are part of the worksheet's formatting. To check this, go to the "Page Layout" tab on the ribbon and click on "Page Setup" in the "Page Setup" group.
4. In the "Page Setup" dialog box, go to the "Sheet" tab and look for the "Print Area" section. If there are any values in the "Rows to repeat at top" or "Columns to repeat at left" boxes, clear them out.
5. You can also try resetting the print area by clicking on the "Clear Print Area" button in the "Page Setup" dialog box.
6. Finally, save your changes and close the workbook. When you reopen it, the extra rows and columns should be gone.