Could Norton Bootable Recovery tool have caused all my folders to become Read-only?

I recently updated my NBRT, thanks to help given here - http://community.norton.com/t5/Other-Norton-Products/Norton-Bootable-Recovery-Tool/m-p/896867


However, I now had a problem -  all my folders in my XP PC became Read-only and I couldn't change their names.

 

I've spent two days** on this and just as I went to get an example to tell you about in this thread, I find the problem has gone away.

 

I don't want to waste anyone's time (& I should just be happy the problem's gone) but is the fact that I had the problem immediately after running NBRT a co-incidence - could NBRT have caused my problem?

 

** There are many threads about this problem on the web e.g. Microsoft forums. Some have said a virus is the cause (Malwarebytes confirms my XP PC is clean) - others say it's a glitch but there's no clear answers.