KA Spencer

Andrew and Kerry

Firstly many thanks for your replies, especially Andrew for the information.
Comments are as follows:

1. RAM
Although I haven't tested the RAM recently, it was tested just before Vista
was installed. Although that doesn't exclude RAM failure, it makes it
unlikely.

2. Safe Mode
I failed to state in my original post, that I had tried both the
"[domain]\Administrator" and the "[local]\Administrator" in safe mode and
they both logged in satisfactorily. But this mode is not suitable for full
administration of the machine. I have also switched off the Themes service,
but to no avail in this case.
Although some of my hardware (ATI graphics and DVD RAM/Multi-writer
Lightscribe drive in particular) have provoked Vista to blue screens, at
present, the main user accounts are definitley not suffering from the problem

3. New Administrator accounts
I have created two new accounts:
"[domain]\Administrator2" and "[local]\Administrator2"
and made them members of the groups
"[domain]\Administrators" and "[local]\Administrators"
respectively, and both accounts log in satisfactorily.

4. Deleting the two ([local] and [domain]) Administrator accounts
I think I shall try the suggestion of renaming the NTUSER.DAT files and
seeing what happens. Certainly the two new Administrator accounts have been
creaed properly so far as I can tell, so something untoward has happened to
the two "proper" Administrator profiles. I think that this is serious enough
for Microsoft to do something about, surely as it leaves a machine out of
management.

5. Files with Microsoft
I have only submitted the files via OCR rather than a paid or free issue
support call as yet. So I am not optimistic about a Micorosft solution unless
I raise a support issue.

So, I shall be interested to have further comments, and will let you know
what transpires.

Regards

Ken.