Hello,
finally after many of tries fixed it so i can enjoy my costum Ui.
As Elestin suggested, i dled Tweak Manager and Made and file "My documents" into C:\Documents and Settings\Owner\ and with Tweak manager i assinged this file as my "My documents" file instead the other "my documents" file that was with greek characters and after this everything worked fine and now i am able to use every ui i download
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So the problem was that documents file was with greek characters so i had to change to english.
Thanks to Elestin for the tips and to everyone who atleast try to help me.
-Fixer