Hmm...a partial result then.

I`m wondering what caused this if you have not had any infection. Why did you run HijackThis a few weeks back?
If you used HijackThis properly there should be an option to "undo" the removal process (if you think that might be the cause)

Then again, if things are working sufficiently well, and having run that reg fix, maybe better let sleeping dogs lie.

Elaine