I want to lock row 1 in Excel. Why is "Freeze Panes" grayed out?

[Fran Z]

I've done this before, and am baffled. I now have Vista/MS Office 2007. The
worksheet is save in 2003 compatibility mode.

 

[Jim Thomlinson]

Is the worksheet protected??? Unprotect it is it is.

 

[Fran Z]

No, it is not protected, but thanks for the reply. What does HTH mean?

Fran Z