help needed... I'm getting crazy.

Hi,
I was using LyX on my linux machine and I've seen that is available also
for windows, but comes with MiKTeX... and here it comes.
I have win7 on this machine
I have sophos antivirus

miktex can't install due to "authorizations". here is the log:

####

MiKTeX Setup 2.9.4503 Report

Date: Friday, March 08, 2013
Time: 04:35:22
OS version: Microsoft Windows 7 Home Premium Edition, 64-bit Service Pack 1
(build 7601)
SystemAdmin: yes
PowerUser: false
SharedSetup: yes
Setup path: C:\Program Files (x86)\LyX
2.0\external\basic-miktex-2.9.4757.exe
UserRoots: <none specified>
UserData: <none specified>
UserConfig: <none specified>
CommonRoots: <none specified>
CommonData: <none specified>
CommonConfig: <none specified>

Installation: C:\Program Files (x86)\MiKTeX 2.9
Loading package database...
starting package maintenance...
installation directory: "C:\Program Files (x86)\MiKTeX 2.9"
package repository: C:\Users\AWAMBA~1\AppData\Local\Temp\mik48206
visiting repository C:\Users\AWAMBA~1\AppData\Local\Temp\mik48206...
repository type: local package repository
loading lightweight database...
lightweight database digest: bb1a4b3c90f91ec159a27c8ce89ca32b
going to install 9490 file(s) (159 package(s))
problem: C:\Program Files (x86)\MiKTeX 2.9\miktex/bin\MiKTeX209-core-PS.dll
does not exist
problem: C:\Program Files (x86)\MiKTeX 2.9\miktex/bin\MiKTeX209-core.dll
does not exist
problem: C:\Program Files (x86)\MiKTeX
2.9\miktex/bin\MiKTeX209-packagemanager-PS.dll does not exist
problem: C:\Program Files (x86)\MiKTeX
2.9\miktex/bin\MiKTeX209-packagemanager.dll does not exist
extracting files from ae.tar.lzma...
extracting files from amsfonts.tar.lzma...
extracting files from amslatex.tar.lzma...
extracting files from avantgar.cab...
extracting files from babel.tar.lzma...
extracting files from bidi.tar.lzma...
extracting files from bookman.cab...
extracting files from carlisle.tar.lzma...
extracting files from cbcoptic.tar.lzma...
extracting files from cm.tar.lzma...
extracting files from courier.tar.lzma...
extracting files from dehyph-exptl.tar.lzma...
extracting files from ec.tar.lzma...
extracting files from elhyphen.tar.lzma...
extracting files from enctex.tar.lzma...
extracting files from euenc.tar.lzma...
extracting files from eurosym.tar.lzma...
extracting files from float.cab...
extracting files from fontspec.tar.lzma...
extracting files from geometry.tar.lzma...
extracting files from graphics.tar.lzma...
extracting files from helvetic.cab...
extracting files from hoekwater.tar.lzma...
extracting files from hyperref.tar.lzma...
extracting files from hyph-utf8.tar.lzma...
extracting files from ifxetex.tar.lzma...
extracting files from jknappen.cab...
extracting files from latex-fonts.tar.lzma...
extracting files from latex2e-help-texinfo.tar.lzma...
extracting files from lm.tar.lzma...
extracting files from ltxbase.tar.lzma...
extracting files from ltxmisc.tar.lzma...
extracting files from lua-alt-getopt.tar.lzma...
extracting files from luainputenc.tar.lzma...
extracting files from lualibs.tar.lzma...
extracting files from luamplib.tar.lzma...
extracting files from luaotfload.tar.lzma...
extracting files from luatexbase.tar.lzma...
extracting files from luatextra.tar.lzma...
extracting files from mflogo.cab...
extracting files from miktex-arctrl-bin-2.9.tar.lzma...
extracting files from miktex-biber-bin.tar.lzma...
extracting files from miktex-bibtex-base.cab...
extracting files from miktex-bibtex-bin-2.9.tar.lzma...
extracting files from miktex-bibtex8bit-base.cab...
extracting files from miktex-bibtex8bit-bin-2.9.tar.lzma...
extracting files from miktex-bin-2.9.tar.lzma...

An error occurred:
  source file: Libraries\MiKTeX\Core\win\winFile.cpp
  source line: 686
  message: Permission denied: C:\Program Files (x86)\MiKTeX
2.9\miktex/bin/internal/miktex-update.exe
  info: C:\Program Files (x86)\MiKTeX
2.9\miktex/bin/internal/miktex-update.exe

####

I can't see anylight at the end of the tunnel... I've googled around all
night (it's 4:38 here) but the trouble persists, everyone says to turn off
antivirus and I DID, really, but I'm always getting the same problems...
I've ran the installation as administrator, as every kind of compatibility
with older win version.... nothing. win's bugged A LOT. permissions are
awful.

is there anyone whitout that antivirus who installed miktex on his/her
machine?

Thanks,
Max
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