Hi, I had again the problem with adding printers that I first posted here, as I already know the troubleshooting I fix it myself. Anyway it worries me that the problem had appear again. I do not know what cause the problem in the first place. One thing that had kept hanging in the air about that problem was that tcpmon.ini file was corrupted and also the source file too. So "sfc /scannow" was unable to repair it. Here it comes the central point of my post: I have with me a tcpmon.ini file from other Windows 7 and I want to replace with it the one I have right now in Windows/System32 (trying them if that action would completly solve the print spooler dissapearing service issue). Of course for that I have or to delete the tcpmon.ini file in Windows/System32 or to rename it or to overwrite it. Neither of that things is possible because a message window shows saying "Need permission of TrustedInstaller for making changes in this archive". So, even and administrator can not change that file! Is there a way to do it anyway?