--- a/windows.rst	Thu Feb 11 14:53:48 2010 +0200
+++ b/windows.rst	Tue Feb 16 15:27:10 2010 +0200
@@ -38,6 +38,11 @@
 
   http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/net_use.mspx
 
+** Activate windows.
+
+  http://www.microsoft.com/genuine/selfhelp/XPPkuinst.aspx?sGuid=bab9e103-6365-44dd-9337-93f0cd9dd4b7&displaylang=en
+                Windows Product Key Update Tool Instructions
+
 * Vista
 
 ** Samba.