You can't go to infinity, as the number of columns has a limit (depending on
which version of Excel you are using).
You can't delete them, but you can hide them.
I have excel 2007.. I'd like to hide them then. How do I do that? When I try
to scroll to the right my spreadsheet never ends .. I was up to 3,000
columns and still going.
If you don't believe me when I tell you that there is a limit, either look
up specification limits in Excel 2007 help, or try to go to column 16,385
(XFE?). [With Excel 2003, the limit was 256 (column IV).]