i just find 5-10 servers and when i look into my console this text appears:

776 servers not listed due to packet loss or pings higher than 500

 

the problem is i got an 50000 dsl connection and when i wait a longer time in main menu iam able to find nearly all servers can somebody help me to solve this problem ?

Could be your router firewall issue which might be filtering Anonymous Internet requests...

what ports do i have to open or what kind of firewall option i need to change ?

Disable your Windows Firewall via Control Panel and go into your Router page (192.168.1.1) and find Firewall and disable it..

Windows firewall shouldn't be the problem. I always advice people to disable the router's and the anti-virus firewalls and leave windows firewall on for their protection.