On our windows XP desktop, all of the passwords are suddenly no good at the Welcome screen. Could this be caused by any viruses out there? Possibly a malicious program? My son keeps downloading stuff and it's possible he installed something with this hidden inside. I can't get into the kid's computer at all - nothing past the welcome screen. What do I do?
what happens if you reboot the machine into Safe mode and try logging in with your password?In addition to the regular user accounts you should also have access to the administrator account which was set up when windows was first installed. This account should be useful in logging on and re-setting your user accounts.
To use a Safe Boot option, follow these steps: