Ok...
I've tried Spybot and Ad-aware SE Personal, but nothing helped.
The problem is still there. I've stopped using limewire now (the new map ''completed'' came up every time)

Name: WIN32.P2P-WORM.ALCAN.A
Zip. Size: 851,7 kb

I tried to delete the zipfiles, but everytime I restarted Limewire the map ''completed'' was still there. How do I get rid of the zipfiles??