I go up to Orange Belt... And i buy some things in the "Shop"...
My antivirus is "NOD32"... Windows XP. I check my Firewall, and I haven't problems with him.

That's your problem. You're an Orange belt you can no longer enter Beginner Servers, try joining Intermediate.

The reason why you cannot play is because you belted up.

Beginners servers are only for white belts, you need to go in semipro and intermediate servers.

Or you can create your own server, too.

To find out more, go here.

Edit: fu fee, I'm totally better.

No way, bro. This isn't Support. ~Fee