I have a problem with an Excel spreadsheet, I cannot view the first column, A. I have tried highlighting the whole sheet and using Unhide. I have also tried hovering the cursor over the line between column B and the "select entire spreadsheet" button, but I don't get the two vertical lines you would normally use to adjust column width.
Perhaps you have inadvertantly set the column width of column A to 0 (zero). If you move your cursor into column A (Use the Goto [F5 Key] command and enter A1 as the cell to GoTo) and the use the Format, Column, Width command and set the width as required. At the same time, as scotty has suggested, unhide the column.
I assume you have data in column A which you need to keep. Select all the cells (click on the box above row 1) and copy. Open a new spreadsheet and select \Edit\Paste special and select values (or formulas) and paste into the new sheet.