Try something like the following:

oExcel.Sheets("Hoja1").Select <- this line pass OK
oExcel.selection.Range("C25").Select <- classic OLE unknown COM state error

or

oExcel.activesheet.Range("C25").Select <- classic OLE unknown COM state error

I suggest this, because, as another Universal thread member pointed out already, when you use 'getObject' you're dealing with a workbook object, not the excel application object. The workbook object does not have a range property, so when you say oExcel.range...etc, Excel doesn't recognize that property. However, worksheet is a property of a workbook, so if you do yourObject.activesheet.range(), you can access the range property THROUGH the worksheet.

Is that at all clear, or was I just rambling again? :^)