I have formatted my computer and reinstalled Vista Home Premium, and as far as I know I've done it correctly. But anyway everytime I now logon I have to press 'Ctrl-Alt-Del' and then open Task Manager, and run a new task 'explorer.exe' and everything is 'hunky dory'. Although its become tedious and am wondering why it keeps doing this, also I've noticed that it takes quite a bit longer to logon than it did before. I have posted a thread related to the same problem before and recieved quick, helpful replies advising me to check certain registry keys via regedit to see if anything was blocking explorer.exe from running. Although don't avoid posting info. on registry keys, if you have anything that may help or I should check about registry keys please post, I may have missed something . Thanks, all help is appreciated, BC.