Hi Wm,

I'm sorry to hear that you're having trouble unhiding columns in Excel. Here are a few things you can try:

1. Check if the columns are actually hidden: Sometimes, columns can appear to be hidden when they are actually just very narrow. Try selecting column E and dragging the column boundary to the right to see if the hidden columns appear.
   
2. Unhide columns using the Home tab: Select the columns on either side of the hidden columns (in this case, columns E and L). Then, right-click on one of the selected columns and choose "Unhide" from the context menu. This should unhide the hidden columns.
   
3. Unhide columns using the Format menu: Select the columns on either side of the hidden columns (in this case, columns E and L). Then, go to the Home tab and click on the "Format" dropdown in the Cells group. Choose "Hide & Unhide" and then "Unhide Columns". This should unhide the hidden columns.
   
4. Check if the worksheet is protected: If the worksheet is protected, you may not be able to unhide columns. Go to the Review tab and click on "Unprotect Sheet" to remove the protection.

I hope one of these solutions works for you. Let me know if you have any other questions or if there's anything else I can help with.