Primeiro troque o "de" por uma barra
Isso vai no form:
no botão proximo:
label1.caption = cint(extractargument(1, label1.caption,"/")) + 1 & "/" & totalreg
no botão anterior
label1.caption = cint(extractargument(1, label1.caption,"/")) - 1 & "/" & totalreg
Function ExtractArgument(ArgNum As Integer, srchstr As String, Delim As String) As String
'Extract an argument or token from a str
' ing based on its position
'and a delimiter.
On Error GoTo Err_ExtractArgument
Dim ArgCount As Integer
Dim MaxPos As Integer
Dim Pos As Integer
Dim Arg As String
Arg = ""
MaxPos = 1
If ArgNum = 1 Then Arg = srchstr
Do While InStr(srchstr, Delim) > 0
Pos = InStr(MaxPos, srchstr, Delim)
If Pos = 0 Then
'No More Args found
If ArgCount = ArgNum - 1 Then Arg = Mid(srchstr, MaxPos)
Exit Do
Else
ArgCount = ArgCount + 1
If ArgCount = ArgNum Then
Arg = Mid(srchstr, MaxPos, Pos - MaxPos)
Exit Do
End If
End If
MaxPos = Pos + 1
Loop
'---------
ExtractArgument = Arg
Exit Function
Err_ExtractArgument:
MsgBox "Error " & Err & ": " & Error
Resume Next
End Function