Lost: Page numbers at foot of Excel

[Segilla]

I have always used my spreadsheet in W 97, using two of the three pages exhibited at foot.
I Copied to my Vista latop, (not sure if I opted to Copy cells into a new sheet as all worked OK).
Opening the spreadsheet in Vista the Page numbers 1 / 2 / 3 are missing from the display but I amsure they were there last time.

Rt clicking Ready at bottom LH of screen shows that Page numbers is ticked.
Is there anything I can do to get at page 2?
I think Page 1 / 2 / 3 should be shown anyway even i all are not in use.
TKS

[Segilla]

Correction.
I should have referred to Excel *Sheets* only one of which can be seen but further experiment reveals that in Full Screen mode, the Sheet Nos 1 / 2 / 3 are now there but disappear again when reverting to normal mode.