Hey,
I tried to install the experimental Miktex 2.9 64bit on my Win7 Home 64 bit
System and an Error occured:

C:\Program Files\MiKTeX 2.9\miktex\bin\x64\fc-cache.EXE: failed
C:/windows/Fonts: failed to write cache
mkfntmap.EXE: The operation failed for some reason.
mkfntmap.EXE: Data: C:\Program Files\MiKTeX 2.9\miktex\bin\x64\fc-cache.EXE
Creating language.dat, language.dat.lua and language.def...
initexmf.exe: The operation failed for some reason.
initexmf.exe: Data: C:\Program Files\MiKTeX 2.9\miktex\bin\x64\mkfntmap.EXE

An error occurred:
source file: Libraries\MiKTeX\Core\Process.cpp
source line: 305
message: The operation failed for some reason.
info: C:\Program Files\MiKTeX 2.9\miktex/bin/x64\initexmf.exe

So I thought, I'll uninstall it ant try again, but it is not listed in the
Windows Program List, from where you would normally uninstall programms.
Can I just delete the Miktek folder in my Programm folder, or is there any
other way to uninstall it or repair the installation?