I'll leave out all the trouble I have had over the past week and just bring it down to what I know now. I can reload my laptop with a clean install of Win 7 and install Avast. After the the first reboot, c:\windows\system32\autochk.exe is infected with Win32:Malware-gen. This is real infection because the hash of the file changes, autochk will not run at boot, and it is not repairable with SFC /runnow. If fact, after running that sfc scan, c:\windows\winsxs\amd64_microsoft-windows-autochk_31bf3856ad364e35_6.1.7601.17514_none_4019f2b8d860ad30\autochk.exe is also infected.
I can replace both files and sfc /scannow runs fine and there is no infection. After I reboot, it starts all over again.
I have deleted the MBR before loading with Super Fdisk.
I have fully run Malwarebytes and Avast
I have run rootkit repair programs - Adwcleaner, aswMBR, Combofix, and Tdsskiller. Nothing changes
Does anyone have any other ideas?