EXCEL WILL NOT LET ME INSERT COLUMNS

[The Hearing Lady]

All of a sudden, my huge worksheet will not allow me to insert columns.
please advise.

 

[mattgoof2005]

The highest column is IV. I think it's restricted by the file-type.

 

[Don Guillett]

check to see what your last available column is
ctrl+end

 

[Mark Lincoln]

Is the sheet protected?

Are you already using the limit of 256 columns? (Column IV is the last
possible column in Excel versions through 2003.)