I don't know, Claudio, but something that might be worth trying is that "Cleanup Disk Space" utility that is somewhere in Windows. It just might get rid of it for you, saving the anxiety.

cheers

>Hi, all!
>
>running WinXP Pro, we have a hidden folder named $NtServicePackUninstall$ under the Windows folder. This folder occupies a little more than 200Mb. Does anyone know what the heck is that for? May I remove that causing no harm to my computer?
>
>TIA