This is a relaxed problem. (Thus I prefer to discuss it here .. rather than in any of the hyper-ventilated forums.)
When I boot up XP under the main user, I get a lockup, hourglass, active, no keyboard or mouse actions allowed, perhaps relating to Internet Explorer. (After a couple of programs like Avira and NoteZilla have loaded, but most have not.) When I crash out Windows Explorer with my task manager (ctrl-alt delete is not disabled, my task manager replacement DTaskManager, comes up and is fully functional) the system can be normal, ready for me to start up the rest of the programs by hand. (A couple have started up by the time of the lockup.) There is no residue of difficulty in that case.
I saw in the "weird window" thread the suggestion to stop a bunch of stuff from starting up in Autoruns and then put back in groups. Sounds like a good idea, I was also wondering about checking the event log, or a load order program and stuff like that. This stuff is squirrelly. The Autoruns suggestion is probably a good idea, any thing to go along with that ? I usually do not reboot that frequently so I have to dedicate some time to this when I am doing other stuff in multi-task. HijackThis style logs is a possibility too.
Here are a couple of other notes.
Paragon's freebie would not install without "administrator" rights, even though my main user is an administrator. No other new programs have had this problem. So I eventually bit the bullet and did ctrl-alt-delete twice at signon, went in as the official administrator, and install went fine. Any thoughts ? This was different than when this type of problem happens and you actually do not have administrator rights. Maybe I will write Paragon, since they are known for high-class customer service. The problem is .. I don't have a problem anymore.
I also have some XP questions (on another puter or 2) similar to the ones in the "weird window" thread. These XPs have the right # on the side, almost surely original motherboard, and the guy gets them from a solid corporation and has to reinstall the OS. (Total investment for 2 puters = $175 and 1 might just become a Linux box anyway and the fellow will help me get them up, if I catch him at the right time.) At one time I think I had XP validated on one but smashed it with an attempted partition. (Ugh). So all this adventure is in process... stay tuned. Again, these are secondary puters, there is no rush, but a lot of the issues overlap the "weird window" thread. In general, if you have a high-class OEM-style wide-mouth Windows XP installer and an original system with the right sticker # on the side, should you have much problem getting XP back up, do you thunk ?