So, I followed the guidelines in the post you forwarded me. First, I should mention that only then did I notice that I somehow landed in the Vista Forum, although my OS is Windows 7. Sorry! So maybe the rest won't be relevant. Just in case it is, I am summarizing my experience.
I found the instructions to fix user profiles for windows 7 (
Fix a corrupted user profile) and followed those. here's the strange thing: at the beginning when i create a new account, the problem isn't there, but when i copy stuff over (except for the nt* files at the root of my user profile), the problem resurfaces. doesn't this mean that some file in my user profile related to something i installed causes the problem?
I should also mention that I had plenty of problems with sharing and security. by default many directories weren't readable and I followed you directions to change that. I followed your suggestions and made all subdirectories fully accessible to the relevant users. That solved the problem with almost all directories. I have one shortcut/link, "Local Settings", that never managed to copy it over. When I try to change the permissions for that file (being an admin) I just get an error message that this isn't possible.
As for my email program, that doesn't seem to be the problem. It works fine copying those files (Mozilla Thunderbird; Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.12) Gecko/20101027 Thunderbird/3.1.6).
I am lost about what's going on, but in any case, your help has narrowed in down to something that is in the user profile, but NOT related to the three nt* files that one shouldn't copy.
Cheers