To remove a hyperlink, you hover over the offending cell and click once with your right mouse.
A set of menu's should appear, and hopefully you will see at the bottom of the list "Remove Hyperlink"
Click once with the left mouse button and the link should be removed and the coloured background.
To check whats in the clipboard at any time, select the Edit menu and then select "Office Clipboard". Follow your nose from there.
What I did to clear your spreadsheet of all possible links and erroneous data that might have been in there, was the following.
1. Select "Window, Remove Split" so that I could now see all the rows in the spreadsheet.
2. I then clicked on the row border 15 (the grey block on the left hand side of the spreadsheet with 15 in it) which selected the complete row.
3. I then held the "Shift" key down on my keyboard and pressed the "End" key and the "Down Arrow" key, and then released the "Shift" key.
If done correctly all the rows from row 15 to 65536 should now be selected.
I then removed all these rows, by
1. Holding down the "Ctrl" key and then pressing the "Minus" key on your numeric keypad (if using a PC)
This will remove all the rows selected and replace with new rows (clean)
2. I then held the "Ctrl" key down and pressed the "Home" key and that takes my cell pointer back to cell A1.
I then did the same for the columns.
1. I clicked on the column border E (the grey block on the top of the spreadsheet with E in it) which selected the complete column.
3. I then held the "Shift" key down on my keyboard and pressed the "End" key and the "Right Arrow" key, and then released the "Shift" key.
If done correctly all the columns from column E to IV should now be selected.
I then removed all these columns, by
1. Holding down the "Ctrl" key and then pressing the "Minus" key on your numeric keypad (if using a PC)
This will remove all the columns selected and replace with new columns(clean)
2. I then held the "Ctrl" key down and pressed the "Home" key and that takes my cell pointer back to cell A1.
It is then important to save the spreadsheet and close it before continuing further with input etc. The reason for this, is that the active spreadsheet is still remembered and this makes the file larger than need be. In your case Excel had an active spreadsheet from A1 to HD30. You can always check what is active in a spreadsheet by holding down the "Ctrl" key and presseing the "End" key once. The active cell pointer should in this spreadsheet case now be in HD30.
When you re-open this spreadsheet and hold the "Ctrl" key down and press"End" you should now only go to D13
The Ctrl + End is a great way to see what area your spreadsheet covers at that point in time, and can amaze you at times.
Whenever I had to sort out peoples spreadsheets in the past, that was one of the first tthings I ever did. It told me a lot about the spreadsheet and its design.
Hope that helps and wasn't too confusing.