Did you delete all rows that the PivotTable was pointed at? My guess would be that you probably deleted the reference that the PivotTable was using to pick up it's info.
What version of Excel are you using? If you're in 2007 or higher, I'd suggest that you make an Excel table with headers, paste your data below the header, then make sure the table covers all the data. Base your PivotTable off that.
When you need to update, you just delete all the data below the header row (this will preserve the reference from the PivotTable to the Table), and then paste the data below the headers and ensure the table covers it all.
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