Editing Goal Seek in Excel

i set up a macro to output the goal-seek result from a BINOMDIST cell:

Sub Macro1()
          Range("C5").GoalSeek Goal:=Range("E4"), ChangingCell:=Range("B4")
End Sub

Where C5 has the value:
  =BINOMDIST(B4,C4,D4,FALSE)

I wrote the program to help find the critical values of a binomial distribution, but sometimes running the macro results in extremely low results like:
  -152537377.264605

and then trying to re-run the macro results in a
  Run Time Error '1004':
  Reference is not valid.

error.

Firstly is there a way to stop the error, secondly is this a good way to go about finding the critical values, and thirdly (if not) what's a better way?

Thanx in advance
Synthetics
LVL 5
SyntheticsAsked:
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DaveCommented:
B4 has to be an Integer so I think you should be wither be using Solver instead of Goalseek or use an INT(Range("B4")) in your goalseek

Cheers

Dave

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