Hi Andacar,
Without seeing your code, it's hard to say what you might be doing wrong. However, there is a simpler way: simply go to Word Options > Advanced > Cut, Copy & Paste and set the 'Pasting from other programs' parameter to 'Match destination formatting'.
For a macro solution, try:
Code:
Sub PasteUnformattedText()
' The next line is in case there's nothing in the Clipboard
On Error Resume Next
Selection.PasteSpecial DataType:=wdPasteText
End Sub
You might want to add this to a keyboard shortcut.