>Hi,
> I need to check if Microsoft Excel is installed for use this:
>
>this.oExcelSession = CreateObject("Excel.Application")
>
> If it's not installed I get an error message.
>
>T.I.A.
You might use an ON ERROR handler that checks for a 1429 Error (i think). You'd have to work out the isolation routines to assure that the attempted instanciation was the culprit (like lineno or program()). Evaluate Ko's suggestion too.