Problems scrobbling

I really hope that someone can help me.

I just got a new computer and the other seems to scrobble fine. This one doesn't.
First it scrobbled all the songs from windows media player, but i didn't want to use it so i changed to winamp. i downloaded last.fm again, but now it won't scrobble on winamp or media player!
The diagnosis says 'could not reach server'.

I remember that one time i had a problem like this, too. Then someone said that i have to check winamp's preferences & plug-ins. The thing is that i don't remember what i should check there, but i can remember that something is missing from the sections! Sounds weird haha.
Hope you understood and can help me :)
Tyvm!

Im using Winamp 5.54.
Last.fm is 1.5.1.30182 (?)
I realized that i maybe have to go to 'get plugin' section, but it says No server set to connect to.