Hope you didn't delete all users. Sometimes windows lets you do that. If that's the case, I don't know any solution. If it's a new install, just install again, you won't lose anything, otherwise use restore point.

I recently had exactly the same problem.  I think that what caused it was that my Spybot Search and Destroy program found a problem lodged in a WIN32 file and deleted that file.  This then caused the same problem as you when booting up.  I also had not set my computer up with any user accounts.   In the end I re installed my XP.  I think that you may find that this is the only way to get round it. 

Thanks for that.  I will be setting up password accounts if only for the security of the computer. Since I re installed XP everything on my computer has been operating perfectly.  I did it with the format option so that I installed a clean version.

 

By the way I have:

 

Dell Optiplex 170L

 

Not the leading edge of computers however I run Office 2003 on it, the internet through my broadband accountand I process my photos on it.

 

Best wishes

 

Buckby Man

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Buckby Man wrote: 
I also had not set my computer up with any user accounts.   

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Of course you set up an user, you can't use windows with no user. It's just that you probably set admin with no password (during the instalation progres the setup asks you this think and you can't skip it :) ).

Thanks - I think this is it.  I appreciate the reply.