Strange, of course. My environmetn is:
Windows 2008 R2 x64 Standard (Virtual Machine)
Regional settings was:
Format: Azerbaijan
Location: Azerbaijan
Language for non-unicode programs: Russian.
I changed regional settings (non-unicode programs and format) to English (United States) the problem solved. I successfully added my email address.
I believe Symantec should test this issue for Unicode languages.
thank you!