user name gone from welcome screen

[Guest]

My computer downloaded the automatic updates, then asked me if I wanted to
restart to complete their installation. I was in the middle of working on
something, so I said no, and later when I was away from my computer it
restarted for me. But now, my user name (I only had one) is gone from the
welcome screen, and I can't get in.

I installed a second Windows XP in the same partition, and through it have
been able to reach all my programs and documents. I noticed it changed my old
user name to "owner", but there is no "owner" on the first XP's welcome
screen either. Is there any way to create a new user name or somehow get into
my old one on the first XP?

 

[Peter]

You could have just booted into safe mode and signed in as Admin then done a
system restore to before this happened. You can't operate two systems on
one partition so remove the new one.
Then do the updates again, this time monitoring what's going on.

 

[Guest]

Thank you, but how do I sign in as Administrator? It's not on the welcome
screen, and when I tried calling up the the logon window, and entering it
with a blank password since I don't have one, it wouldn't sign me on. Nor
would it after setting an Admin password and using it...

 

[Peter]

Admin in safe mode (tapping F8 while booting up) the pasword is usually not
set unless you have added one.

 

[Peter]

also read this:
http://www.cyberwalker.net/faqs/reinstall-reformat-winxp/two-copies-xp.html