Modifying VBA Search Code

I have the following code in use on a userform within my workbook.

Basically it searches by a particular column for a numeric value and then pouplates the userform with the contents of that row.

Private Sub cmdSearch_Click()
   Dim rw As Long             'row the search value was found on
   Dim myVal As Long          'converted search value
 
   On Error Resume Next
      'validate user input
      If txtSearch.Value = "" Or _
         Not IsNumeric(CLng(txtSearch.Value)) Then
         MsgBox "Enter valid SIR number!"
         txtSearch.SetFocus
         Exit Sub
      End If
 
      'convert the TexBox value to  data type long and get row number
      myVal = CLng(txtSearch.Value)
      On Error Resume Next
 
       With Sheets("SIRs").Range("C:C")
         Set cell = .Find(myVal, LookIn:=xlValues)
         rw = cell.Row
       End With
   On Error GoTo 0

   On Error GoTo 0
   If rw = 0 Then
      MsgBox "SIR Not Found"
   Else
      Call PopulateTextBoxes(rw)
   End If
End Sub

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I now want to create a new search function whereby it searches another column (E) but for a non-numeric value this time. Naively I assumed I could copy the above code, tailor it for column E and remove the following piece of code

Or _
         Not IsNumeric(CLng(txtSearch.Value)) 

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Unfortunately it keeps returning a 'SIR not Found' result.

can anyone help please?