I'm on a net work that is shared. I have recently noticed event logs of another user logging on to my laptop. The first log on used my credentials and a name similar to mine. The next one was of that person changing the credentials and authority of that log on. After that there quit a few logs each changing and raising the authority of the log on before it. Since then i have reinstalled my OS. But now I am unable to connect to the server at zone alarm to down load and install the program. I believe i know who logged on to my laptop. I have no idea how to stop them from doing this again. Can someone please help?