[Firebrick]

Recently I got the nasty "Trojan Horse Dropper.Generic_c.MMI" virus.
Found it with AVG, it cleaned up two reg errors caused by it. But not the virus itself, it was hiding in System32's -Services.exe
I looked around for a way to fix it, and found a solution.

"1. Go to start, type "cmd" and hit CTRL+SHIFT+ENTER, to run in admin mode.
2. Type or copy & paste "sfc /scanfile=c:\windows\system32\services.exe" and press enter
3. Restart your computer
"

This worked, I run AVG again, and it was gone.

Others had repeat problems for it, and was later discovered that the serves.exe had no permissions set. It was recommended that permissions be set at a high security level to prevent this again.

Here's where I think I messed up, I set permission for Admin - and made it allowed to read, but not write.

It worked for the entire night everything was fine, restart, virus scan, all good.

Now when I go to turn it on, it crashes at start-up and Start-Up Repair does nothing.

Advice, or fixes? I can get cmd up, but can't go into safe mode.

Also if I do F8 at start- and try Directory Services Restore Mode:
It loads windows\system32\drivers\avgidsha.sys last then crashes.

I would prefer not to do a clean reformat, as I don't want to lose some important data.