Cannot get past Windows XP Welcome screen

message from =?Utf-8?B?U3RldmUgV2lsZGVy?= on 6 Jun 2004
Using a pentium machine with 500mb of ram.
Windows XP lost power during a storm and when it was rebooted it boots normal and goes to Welcome screen. When the user is selected it loads and flashes to desktop for 1 second then returns to Welcome screen and logs off. I have tried to go to safe mode. It goes to safe mode into Welcome screen, selecting Administrator will do nothing, selecting user prduces same results, flashes to desktop for 1 second.
chkdsk has been performed and no problems found.
 

Archived message: Cannot get past Windows XP Welcome screen (Microsoft Windows XP)