It's Win32::Lanman! If you do use Win32::LanMan the module doesn't initialize properly and doesn't export the constants!

On the other hand I did have the code a little wrong. I now tried

use Win32::Lanman;
Win32::Lanman::GrantPrivilegeToAccount( Win32::NodeName(), SE_SERVICE_
+LOGON_NAME, ['Guest']);
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Jenda
Always code as if the guy who ends up maintaining your code will be a violent psychopath who knows where you live.
   -- Rick Osborne

Edit by castaway: Closed small tag in signature