There is no changelog to be found.
<http://free.antivirus.com/hijackthis/>

Note that there is an *.msi installer and *.exe - up to you to choose which
you would like to install.

Under Win 7 some have noted (not officially)
* Fixed parser issues on winlogon notify
* Fixed issues to handle certain environment variables
* Rename HJT generates complete scan log
* No aesthetic changes of interface, aggregates, or functions

Silj

--
"Arguing with anonymous strangers on the Internet is a sucker's game
because they almost always turn out to be -- or to be indistinguishable from
-- self-righteous sixteen-year-olds possessing infinite amounts of free time."
- Neil Stephenson, _Cryptonomicon_