My mistake was to follow a Tweak that I found on another site. I am running XP pro and the tweak was to close some of the programs running in the background,, as I keep getting low virtual memory messages. The tweak said that 18 running programs could be closed without trouble if I wasn't on a network. I closed them down, but when I rebooted I couldn't get passed the Welcome Window. The computer was completely frozen and could only be turned off at the wall. I wanted to get into Safe Mode to see if I could reenable the closed programs, but I couldn't. Nothing else worked. Can anyone tell me if Safe Mode is an option with XP pro and if so how to get into it.