Question : Arguments are of the wrong type SQL error

It appears that I am going to struggle to get every SQL statement I ever write to work 1st time! At present I have the code below but seem to get a 3001 error - "Arguments are of the wrong type, are out of acceptable range or are in conflict with another".

txtUsername variable value is "simonwait"

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Dim rsPubs As ADODB.Recordset
Set rsPubs = New ADODB.Recordset
Dim enPubs As ADODB.Connection
Set enPubs = New ADODB.Connection

If txtUsername = "" Then
MsgBox ("No user selected")
Exit Sub
End If
'Now open the connection.
enPubs.Open strConn
With rsPubs
    ' Assign the Connection object.
    .ActiveConnection = enPubs
    ' Update the required records.
.Update "Users SET Removed=1 WHERE Username='" & txtUsername & "'"
 .Close
End With

dnPubs.Close
Set rsPubs = Nothing
Set enPubs = Nothing

Answer : Arguments are of the wrong type SQL error

Here is the final code (tested and worked for me):

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Dim rsPubs As ADODB.Recordset
Set rsPubs = New ADODB.Recordset
Dim enPubs As ADODB.Connection
Set enPubs = New ADODB.Connection

If txtUsername = "" Then
MsgBox ("No user selected")
Exit Sub
End If
'Now open the connection.
enPubs.Open strConn
With rsPubs
    ' Assign the Connection object.
    .ActiveConnection = enPubs
    .CursorType = adOpenKeyset
    .LockType = adLockOptimistic
    .CursorLocation = adUseServer
    .Open "select * from users WHERE Username='" & txtUsername & "'"
    ' Update the required records.
    If Not (.EOF Or .BOF) Then
        !Removed = 1
        .Update
    Else
        MsgBox "Username does not exist: " & txtUsername
    End If
    .Close
End With

enPubs.Close
Set rsPubs = Nothing
Set enPubs = Nothing