You can remove MacFUSE by running the following commands in Terminal (or by manually removing the following files). As always, be careful when running commands in Terminal.
sudo rm -rf "/Library/Application Support/Developer/Shared/Xcode/Project Templates/MacFUSE"
sudo rm -rf "/Library/Filesystems/fusefs.fs"
sudo rm -rf "/Library/Frameworks/MacFUSE.framework"
sudo rm -rf "/Library/PreferencePanes/MacFUSE.prefPane"
sudo rm -f "/Library/Preferences/com.google.macfuse.plist"
sudo rm -rf "/usr/local/include/fuse"
sudo rm -f "/usr/local/include/fuse.h"
sudo rm -f "/usr/local/lib/libfuse.0.dylib"
sudo rm -f "/usr/local/lib/libfuse.2.7.3.dylib"
sudo rm -f "/usr/local/lib/libfuse.2.dylib"
sudo rm -f "/usr/local/lib/libfuse.dylib"
sudo rm -f "/usr/local/lib/
libfuse.la"
sudo rm -f "/usr/local/lib/libfuse_ino64.2.7.3.dylib"
sudo rm -f "/usr/local/lib/libfuse_ino64.2.dylib"
sudo rm -f "/usr/local/lib/libfuse_ino64.dylib"
sudo rm -f "/usr/local/lib/
libfuse_ino64.la"
sudo rm -f "/usr/local/lib/pkgconfig/fuse.pc"
Please note that MacFUSE is a passive system component. The errors you are seeing when you start your Mac are an indication that "something" is trying to mount a MacFUSE volume. This something could be an application that is started automatically when you log in or maybe an old version of NTFS-3G. You might want to remove that application, too.