I'm using SRWare Iron 11.0.700.2. When I try to log-in with my username and password in any site (YouTube for example) it shows me this error :

However, when I try to login with the installer version, I can't manage to enter the page without the error popping up and the password is not saved. When I try to login with the portable version, I can enter the site (password is not saved again), but after logging out and logging in again, the error pops up! Even if I try to check "manage my saved passwords" the error still shows up. Right now I'm using Mozilla Firefox 4.0.1 and I'd really like to give this browser a chance. By the way, my OS is Windows XP SP3.
Thanks in advance!