Finally able to run MGTools but still really bad malware

Hi all,

I've had malware on my pc, there's still a lot of it there, but at least I can boot and run *some* stuff.

Genuine Windows 7 Ultimate x64

This is how it started:

I've had G Data Antivirus as my only scanner, 2 days ago it disabled all of a sudden, some icons on my windows got a strange little extra icon (I think it was a motorbike) on the bottom right.
All seemed fine and I was stupid enough to put the pc off, go to sleep, came back the next day and wasn't able to run about anything.
My pc would reboot after 2-3 minutes telling me something about DCOM or Power Service. I've managed to stop that process by running shutdown -a

Hitman Pro did not find anything except tracking cookies
Malwarebytes Anti Malware did not find anything
AVG boot cd did only find some tracking cookies
Hitman Pro Kickstarter runs for 3 minutes, then the system reboots, nothing I can do
Windows Installer does not work, I also can not remove programs for the most part
Most of the options on the control panel are disabled
About all .exe-files are "shielded" and tell me I don't have permission, however there's only 1 account on the pc and that's an Administrator account with UAC disabled.

Later every .exe I tried to run except my browser just did not run.

In safe mode everything runs fine, except some tools can not be used in safe mode. I've done a lot of virus scanning (about every online scanner there is, one by one) they all come out clean.

Finally I was able to restore some permissions through MGTools scripts within Safe Mode, now I can access most .exe files. There's no yellow/blue shield anymore. So I was able to run MGTools.

There is no way to disable my virusscanner or remove it (no permission) but it's already disabled.
There is no way to remove any other tools (no permission)
I can't run Windows Setup within Windows, so I cant perform an in spot upgrade (I was hoping this would fix files and registry).

I'm about to give it up, but maybe, maybe you have some knowledge to help me out.

I can't do much, also it wants to reboot every time I boot, so I can stop that, but that's about it. Attached MGTools MGLogs.zip
I hope there's another solution than a full reinstall.