[How Can I Remove Text in Avatar Label?]

the "WINTER SKIN EXPO '09" is a group tag. I've seen quite a few newbies with it on. Follow what was posted previously on how to change group tag.

[My account was disable by linden lab without reason or warning]

You probably got reported, when your brother used your account.

And if anyone but you uses your account, thats bannable too. it's in the Terms of service.