[ubuntu] Folder not opening.

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http://ubuntuforums.org – Hello, I have been fooling about on my Ubuntu 10.04 PC and now when I try to open a folder with the Places menu, it opens with Totem and the videos in it starts playing automatically. But I cannot get it to open with nautilus. I also tried with Cairo-dock and Gnomenu but nothing happens. I tried removing Totem and now when I open it a Dialog appears saying: Could not open location 'file:///home/ubuntu/.wine/dosdevices/c:', No application is registered as handling this file. The only way to open my folders are by clicking their links on my Desktop. Please help. Thank you (Hardware)