sfc /scannow is the command that will check your system files and repair any that it can, but this article will explain how to run it and how to post just the bits that it has checked/repaired, although you haven't said which version of Windows you are running.
http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.htmlIf you are using XP then the command chkdsk /f or chkdsk /r would be better as you don't need an install CD as you could be prompted for when running the sfc /scannow in XP.
With XP you auto have an elevated command prompt but with Vista or Win 7 you need to do it this way
http://technet.microsoft.com/en-gb/library/cc947813(v=ws.10).aspxThe /f switch checks and repairs files whereas the /r switch checks for bad sectors on the disk as well as repairing corrupt files.
Chkdsk needs the volume to be dismounted before it can run a repair so after entering chkdsk with either the /f or /r switch, you will be prompted to type and enter y then reboot to let it do its thing.
To view its full report go Start orb - type eventvwr and press enter - this will open Event Viewer and when it has read the logs, click on the arrow to the left of Windows Logs then click on Application - Action - then on Find.
In the Find box type either chkdsk or wininit and press enter.
Close the Find box and then read its report.
To copy its report to the forum click on Copy in the lower right pane then on Copy details as text.
You can then place the cursor in the Reply box, right click and select Paste.
It may need editing a bit so it isn't all bunched up and will make it easier to read.
Booting up into Safe Mode with Networking will isolate your AV program and any other 3rd party programs that run on Start up should they be the cause of a conflict.
You haven't said if you have tried Notepad as an admin.
You can do this by going Start - type notepad - right click on Notepad and select Run as administrator.