This is what the Edit box looks like:
It is located at the bottom right of your posts
Do not Edit (and then add text) UNLESS (sorry for caps there) yours is the last post in the thread, of which it presently isn't.
Now combofix
Please run Combofix in Safe Mode (safe Mode accessed by pressing F8 key before windowws starts up)
If it still doesn't work, then run
Combofix /U (please note one space after combofix)
Then download and run Combofix again (note: disregard any Antivirus warning during the scan, basically Combofix will remove malware found itself)
Yes the log attached (ie this button >
on the new reply toolbar) would be good