Use the GetUserName api function.
Code:
Private Declare Function GetUserName Lib "advapi32.dll" _
Alias "GetUserNameA" (ByVal lpBuffer As String, _
nSize As Long) As Long
Public Function UserName() As String
Dim llReturn As Long
Dim lsUserName As String
Dim lsBuffer As String
lsUserName = ""
lsBuffer = Space$(255)
llReturn = GetUserName(lsBuffer, 255)
If llReturn Then
lsUserName = Left$(lsBuffer, InStr(lsBuffer, Chr(0)) - 1)
End If
UserName = lsUserName
End Function
Usage:
x = UserName()
Msgbox x