Thanks, but I also have the Windows Defender enabled... anyway, is not the case, the comp. is not infected. Is just IE8 and the messenger and live mail that don't remeber passwords and usernames -...

Nope, nothing like that. Is not infected. I'm using AVG free... is good enough.
Anyway, I've found out on microsoft 's forum a lot of people having the same problem with live messenger - it appears...

I forgot to say that I don't have any software installed that cleans the cookies or the temporary files etc.

So, is been a month now since IE8 doesn't remember the usernames, passwords and whatever else I type in forms. And this is very annoying, of course.
And even bigger problem (I think they're related)...