If you haven't started yet, I have additional enhancements to suggest.
1) disable System Restore
2) in Safe Mode, bring up Task Manager > Applications tab > New Task button and start a command-line window with
cmd.exe.
3) copy that big long command
4) use Task Manager to
end explorer.exe. POOF, the taskbar and Start menu go bye-bye.
5) paste the big long command into your command-line window and let it do its scan
6) after the scanner is done, use the New Task button to start explorer.exe again
I was looking at some descriptions of new malware at Symantec and I see that some of it will inject itself into explorer.exe, so this may help. < / speculation >
Any ideas on how this would've gotten hold of your system? Someone in your household open a copy of
the email described here, maybe? (Thursday Sept. 1 item)