XP reload, other user accounts now not working

Hi team,
I had to completely reload XP pro SP2 onto my Desktop last Friday. The
repair option didn't work.
Now, I have finally rebuilt the Software back onto C:\ and I came to set up
another account for my son.
Through Control Panel\User Accounts, set up ne account as usual, changed
picture to Ben10 (Whatever!). Come out of control panel and sign off\switch
user to the new one. Nope, a window pops up with the title "User
environment" and tells me "Windows cannot log you on because your profile
cannot be loaded....check your connected etc. etc."
This also happens if I switch the Guest account on and try to use it.
There is something not quite right in the Control panel\User
Accounts......the icons are all missing from the 3 help topics and the top
line. The red box/white cross is there instead. I would like to repair this
without another ZP load. Oh, the repair option didn't seem to work, I booted
from CD and chose repair, entered password etc. but nothing happened.

Another question, after the reinstall, I have the System account ASP.net
etc. I know this is a critical account that should be left alone, but I
believe Tweak UI can hide it from showing in the accounts page. I can't find
such an option in Tweak UI, can you direct me please?

Thanks in advance.