Well I have followed these instructions and now skype won't launch.I go to the general menu -> internet -> Skype, but nothing happens.
I have reset Exect=Skype and it now boots again but with the same webcam issue.
I don't know what could be wrong 
I hope you made less typos in those commands than you did reporting that one.
As I have it right now and it doesn't launch:
[Desktop Entry]Name=Skype
Comment=Skype Internet Telephony
Exec=LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so /usr/bin/skype
Icon=skype.png
Terminal=false
Type=Application
Encoding=UTF-8
Categories=Network;X-MandrivaLinux-Internet-InstantMessaging;
X-Desktop-File-Install-Version=0.11