TrendMicro now offer HijackThis, updated,
Here
Sanctioned by the program author. (Merijn. He's sold (?) it)
Original (final version by Merijn) still available for download
Here
Sites that do the analyses seem to be happy to examine results from either version. I notice no major difference between the two.
Important to install the application in its own folder (Typically C: \ HijackThis)
rather than running from the download location.
I've found
CCleaner forum
to offer good help, also
Castlecops. They are two of many, though.
[EDIT] Suggest if using this latest version that the "analyse this" (upload results to trend micro) button is NOT used, as the privacy policy re: who they share the results with is loose. (ie; no control over what "partners" use the info for.)