Add Network Location not possible. IE x86 crashes when IE x64 is open. Settings in Guest account are not kept.

Hello!
1. Windows Vista x64 shows an error message
"Add Network Location
The folder you entered does not appear to be valid. Please choose another."
after clicking Next in "Specify the location of your website
Type the address of the website, FTP site, or network location that this
shortcut will open" window.
The folder is http://files.akado.ru/slide/files/51796441/home/
I can add the Network Location in Windows XP by doing the same.
All updates are installed.
Norton Internet Security 2008 is not installed.
The account is administrative.
2. IE x86 crashes during opening a page when IE x64 is open.
3. Windows does not allow to turn on the language bar and input a switch
language keyboard shortcut in Guest account: it turns language bar and
shortcut off after clicking "Apply".
Sincerely,
Dima