After the update, Windows comes up asking a password

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From: tomato (tomato_at_discussions.microsoft.com)
Date: 12/17/04 

Date: Fri, 17 Dec 2004 14:15:02 -0800

I installed this update:
Security Update for Windows XP (KB885835)
Date last published: 12/14/2004

After I restarted Windows asked a password to login my account (I had no
password at all !). I had to recover the last working session (F8, etc...).

I put a password for my account. I installed the update again. The password
was not correct. win Changhed it!

Is it Windows XP quirky or should I change operating system?
BTW, any help is appreciated.

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