Many don't clean out the spyware before the update.
Tell what you did to get ready.
You likely installed not only SP2 but .NET which is an optional module for most. It would have it change to multiple logons and you will get the logon back until you use tweakui or what method you prefer.
In closing, don't fall for "I'm the only user" trap. Many forget to have a spare account in case their profile suffers some damage and get locked out.
I recently installed the Win XP Service Pac 2 update and ever since my system seems to be deteriorating at an almost hourly rate. The system is crawling along; extremely slow to open or close any programs; very slow to shutdown; lots of background things going on ? trying to almost constantly update MS software; asking for passwords at startup and to access MS programs ? I have no passwords on the system since I am the only user. In addition, using Photoshop [which is my business!] has become a major chore ? the system is sluggish in executing any commands, opening files, editing, etc. I do not receive any error messages; however, the system hangs on what, at least to me, appears to be a random basis. I have been unable to duplicate a crash/hang that occurs when using a particular software or executing a command. All of these problems appear related to this update, since prior to installing the update the system ran well. I have already attempted to restore the system to a point prior to installing the update but I was unable to do this because the system does not appear to recognize any restore points. Any advice? Ideas? Help? Thanks!
System specs: Pentium 4, 2.4 GHz; 1GB Ram; 80GB drive; 2 ?external drives. Microsoft Windows XP Pro with Service Pack 2