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I know that this thread was initially about "Message On Opera Startup".
I want to make sure you understand, I haven't opened Opera (any version) for more than a week). I think that's important to keep in mind when considering that the file(s) found are identified as containing Foxiebro.
I'm unfamiliar with the VirusTotal site. Why is Acronis listed with Windows Defender? I recently installed Acronis and had so many problems with it that I uninstalled the program. I used to think it was great. But it compromised and slowed my system so badly that I wasn't going to put up with the issues and uninstalled. There may be a connection.
Leocg is correct. The ending numbers changed. The file was being replaced each time Defender would quarantine the last. That's usually a big indicator that it's an infection when a file continues to be replaced if moved or deleted.
They were found in:
C:\Users(USER)\AppData\Local\Temp.opera\BBDC4C234B27\Opera_installer_20100218063921710520.dll (and a second file in same location at the same time with a different number for \Opera_installer_2010...
With each error message the 2 ending numbers for the dll files would change)
After 7 times there were 4 files found in the same location. After finding 4 (which were quarantined), only 2 were found each time. A total of 15 times Defender identified Foxiebro and quarantined the files. It only stopped after I booted into Safe Mode and removed all Opera files.
Even if Defender is the "only" engine finding identifying the file, don't you think it's something Opera developers should be reviewing / investigating to see "why" that file was identified even by one engine as having malware? Clearly Opera was exploited. And to identify a "specific" name of malware, as opposed to assigning a generic name and calling it a PUP with a low threat would be expected if it was a false positive. But to have been assigned High threat with a specific name seems more than something to disregard.

Burnout426 - I appreciate your attempt, but although I know how to add an exclusion, it seems to me that you missed a big part.
I haven't used Opera in more than a week. It's not been opened - at all.
I was working on graphics all day (more than 7 hours) when the first error message popped up.
That part alone has me scratching my head as to why, suddenly, Opera, for the first time in years that I've had Opera installed, did I have a problem. And it's with the "developer" version - not the standard Opera.
Further, "Foxiebro" was specifically identified in the dll. It wasn't something "standard" that was blocked of Opera. It was a very specific file with a very specific malware attached. Foxiebro has been around a while. So it's not like there would be a false positive because it's new.
If Defender specifically identified Foxiebro, and, Opera was unable to complete an install that it was performing when the browser was not open, there is NO way I would add an exclusion for that file.
After screwing around for a couple of hours, I ended up restarting into Safe Mode and was finally able to delete everything related to Opera.
Again, that too told me that somehow Opera got infected. I still like Opera. But I'm not going to reinstall until I've seen that Opera developers have specifically addressed that security issue. I'm betting that a hacker found a backdoor to Opera, slipped in the malware and that' what caused my issue. So I have no desire to reinstall until know for certain that Opera has been cleaned.
I run a very tight security with my machine. I've been developing Web sites for more than 20 years and security has always been an issue. I haven't had an infection (until this) for years. I plan to keep it that way.

@blackbird71 said in "Profile Error Occurred" - Message On Opera Startup:

@andrius-s You've done the right and necessary things. What I'm wondering is if others have reported the problem via Opera's bug reporter in order to elevate its significance. With any browser, there's always a background "noise level" of user problems, and the ones that are reported by the most users tend to be elevated in visibility out of that noise level in the bug-tracking systems, hence getting attention sooner. I don't work for Opera, but that's the way it works with most software development... developers are busy folks, and the more consistently a given problem is reported, the more important it will tend to loom in the competition for developers' precious time and effort.

I have done the same. No less than 2 submissions about a "bug" and no response. What I do not find in this thread is the fact that Opera (30.0.1835.59 and 25.0.1614.68 and worst developer 73.0.3827.0) refuse to uninstall. Opera developer has thrown several errors just today (no less than a dozen) without my doing "anything".
All Opera browsers have been closed, and still developer throws the error. It seems as if it's attempting to update, but cannot.
Additionally, Windows Defender (I do not use any other anti-virus) has quarantined the dll file each time the popup appears, stating that it's a high risk threat with Foxiebro.
I'm unable to use standard methods of uninstall on all 3. So there is no method of deleting all of the files related to the 3 versions.
I haven't used "any" Opera version for more than a week. I've never had any problem with Opera and had at least 1 version installed on my machine for many, many years. Today was the first problem and it's stopping me from working - costing me money. My machine even turned off while I was trying to find a fix. I did have Windows Defender doing a "deep scan" and that, along with WD trying to keep the dll file from infecting the computer may have been the cause of the automatic shutdown.
This is wrong. The attempts to assist are appreciated, but we really need Opera technical support to review "this" thread ASAP.
I cannot find anywhere that completely uninstalls Opera, and I'm not willing to use some "free" software that states it can and have my system infected worse.
Opera "should" simply uninstall. I've never used it as admin, so there is nothing "I" have done with Opera that would even hint as to why it's not uninstalling. Opera "was" still functioning normally when I open it. But the fact that the errors continue to pop up and Windows Defender continues to quarantine Opera_installer_20100220564441612460.dll tells me that the file is infected because it creates another each time Windows quarantines the last. This has been going on for more than an hour, and in that time Windows has quarantined 11 files of the same name.
So let's get to the bottom line. How can Opera - all of them - be successfully uninstalled?