EXCEL VBA - EXIT SUB freeze workbook when it's TRUE

Hi All
I searched for something similar but I didn't find any. I have a situation here. See described below.
I have a code that update a template with a simple condition. If the condition is TRUE abort the UPDATE process.
If is FALSE continue running the code:

...

Sheet24.Activate
With ActiveSheet
LastCol = .Cells(2, .Columns.Count).End(xlToLeft).Column
If LastCol > 34 Then
MsgBox "myText" & Chr(10) & "Update Aborted!", vbCritical, "Number of weeks exceeded."
Exit Sub
End If
End With

...

When I find the condition TRUE, the code STOP, EXIT but my workbook stay frozen.
To use it again, need to close it and re-open it.
When the condition is FALSE, everything works fine.

Question:
How to make the code really STOP when the TRUE is found but allowing me to use the workbook without closing it.

I appreciate any help

Thanks and regards
A Mota

No make sense. I can't insert an END SUB outside of my IF conditions or after finish WITH.
Need to have END SUB only if the condition match otherwise the code doesn't run.

Any help?
Thanks

Thanks Arkadi
This is the main SUB and I call another SUB from this if the condition is FALSE as you can see below.
When FALSE worked perfect.

...

Sub Refresh()
Dim sFile$
Dim LastCol As integer

LastCol = 0
Sheet24.Activate
With ActiveSheet
LastCol = .Cells(2, .Columns.Count).End(xlToLeft).Column
If LastCol > 34 Then
MsgBox "Please close it and " & Chr(34) & "Adjust" & Chr(34) & " the Metric." & Chr(10) & "Update Aborted!", vbCritical, "Number of weeks exceeded."
Exit Sub
End If
End With


sFile = ActiveWorkbook.Path & "\" & "Excess.xls*"
If Dir(sFile) = Empty Then
OutPut = MsgBox("File: " & "EXCESS" & vbCr & "...was not found. Do you want to IGNORE it?", vbYesNo + vbQuestion, "File Doesn't Exist")
End If

Call DataInventory 'Populate Data to Inventory Projection

MsgBox "Metric Updated!!!"

End Sub


...

Yes. I have a button to call SUB REFRESH. If condition is TRUE msgbox pop up and I need to hit "OK" to leave the procedure.
After that. this workbook and any other opened workbook, stop working. I have some drop down menu to change the chart values
but doesn't update any chart as well.

...
MsgBox "Please close it and " & Chr(34) & "Adjust" & Chr(34) & " the Metric." & Chr(10) & "Update Aborted!", vbCritical, "Number of weeks exceeded."

I didn't attached the file because is too large. Have more than 50 sheets. Everything is working fine but this condition (EXIT SUB).