What do you mean your account is gone?
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Microsoft Games\Age of Empires 3\1.0]
That's from a 64 bit OS, might be a different reg key in 32 bit.
Game Key Revealer found my AoE3 key
If you legitimately bought it, call support and ask them what's going on.