Serious bug in win7

i've accidentally set Administrators Group deny Full control on a harddisk using Administrator account.

and now nomatter what i do still can't get my permissions back.

i've try takeown ,cacls commend ,all got access dened
even run as SYSTEM still can't.

HELP

Hi -

See if Windows System Restore can help - choose a restore point before the permission setting changes -
START | type rstrui

Regards. . .

jcgriff2

`

i've disable Windows System Restore
and no backup any restore point

I'm afraid you're left with a clean reinstall of Windows then...however, if you can, install the new Windows to a different harddisk or different partition, then you might be able to regain ownership of any files you need to recover from the current system.

Messing with permissions from an administrator account without having restore points or backups is not very smart. Sorry to be blunt...

If I go out to my car and throw a wrench through my front windshield, I can't call it a bug and blame BMW. There is absolutely no reason to be messing with permissions on Windows 7, especially not on your system volume. As mentioned, it seems like your only option is to back up and do a clean install.

its was a accident
i've click cancel immediately when the loading bar comes up.

why even system account can't access this ?
i only set the Administrators group deny
system account is a member of admins group?
as i remember the system account have full control of this harddisk

If it was me, I would probably just go the route of the clean install. I wouldn't ever trust a system again once it had an issue like this. In two hours, you could be back up and running with a new install, fully updated.