EXCEL 2007
Try the following:-
1. Right click somewhere in your Pivot Table and select PivotTable Options .
.. .
2. The PivotTable Options window should launch / Layout & Format tab /
remove the tick (check) from Autofit column widths on update / OK
You might also try, if you have lost formatting, re-applying it quickly by
clicking in the Pivot Table / PivotTable Tools / Design contextual tab /
PivotTable Styles group / clicking one of the styles in here will format your
Pivot Table quickly.
If my comments have helped please hit Yes.
Thanks.