Oracle with Java is another bad one too (if you're unlucky enough to have to have it installed).

Bonjour is one of the worst offenders for putting spurious errors in Windows Event logs I've ever seen. Usually someone installing iTunes is the culprit.

>Yep - and Adobe is not alone in doing this now days either. One thing I would check is all the windows services running on that machine too. I've seen cases like this where the Bonjour service gets installed, and the uninstallers didn't remove it. There are legitimate uses for the service - but a lot of companies don't want it on their network.
>
>>Had a support call from a client yesterday. All of a sudden:
>>
>>- Home page in all installed browsers was changed and could not be changed back
>>- Antivirus protection was set to something he didn't recognize, and changes were disabled
>>- He kept getting popup notifications in the System Tray, that problems were detected on his computer and the System Tray application could "fix them"
>>
>>Turned out he installed an Adobe Acrobat Reader update without un-checking the default opted-in extra garbage:
>>
>>- Home pages were all changed to Yahoo!
>>- Norton 360 (trial? who knows) was installed, Windows Defender disabled and ability to change security software settings was disabled
>>- The popup was apparently "Norton One Stop", whatever that is (hadn't heard of it before)
>>
>>I find it incredible that the default installation of an Adobe Acrobat Reader update makes changes to a user's machine that are indistinguishable from a malware attack. This is no longer merely annoying, it's costing real people real time and money to mitigate.
>>
>>It's a shame Adobe has to be considered the gold standard for PDF handling. Alternatives such as Foxit are looking more attractive all the time.