What do you actually need to posses to do a repair install of windows 7 back to a known good configuration?
I can get to BIOS and go to the repair my computer option, to which you get these options:
But I dont know what file will be that known good config. We got a nasty trojan (sirefef.y) that apepars to have amended endless settings on the PC, for example in security centre you cant now open the firewall, or windows update, as you get errors saying "action center cannot open xyz".....
I tried sfc /scannow and it doesnt seem to do find anything but there are genuine issues.
I also tried removing all past AV products with their official uninstallers and then reinstalling security essentials.
I could do with some sort of restore that doesnt lose user data like documents, pictures, vids etc, but restores all key service/system files back to known good state.
If system restore points need to be configured manually I highly suspect there wont be any on the machine.