Thanks Ponch Actually the problem has been forcasted in your phrase "Don't forget to select the proper language at download" After your advice I did the following 1) on MS site I downloaded the complete SP3 choosing, at first, the ITALIAN version During the nliteing process an error was detected due to incompatibility in the language 2) Fine, so I downloaded the english version, but the same error was detected 3) Good, so as the original CD was an Italian one, I supposed the automatic updated version of SP2 or SP3 that I installed first (according to my previous post) were from an other unknown language (indeed I supposed the automatic download would have detected the language version before making the download itself, so downloadind the appropriate modules depending on the language, ..... anyway...) Thus I uninstalled from the APPLICATION INSTALLATION in the CONTROL PANEL, the SP3 than trying to uninstall the SP2 and starting back with the italian SP3 version from the SP1 that is in Italian (or should be, according to the CD labelling) 4) The SP3 was uninstalled but then there was no possibility (in the uninstalling window as appeared before) to uninstall the SP2. The system indeed is recognised as a WINDOWS XP SP2 version What do you think about this jam ? Ciao !