I would be very surprised if F-Secure let through lots of trojans and viruses unless you are looking at zero-day malware. Spyware/Adware/PUPS I would understand.
Give F-secure another try and try regular on-demand scans with Malwarebytes and you should stay malware-free.
Latest real-world test over at av-comparatives indicate that F-Secure will give you good protection; http://www.av-comparatives.org/wp-content/uploads/2014/05/avc_factsheet2014_04.pdf
But ANY antivirus cannot give you 100% protection so you should also carry out regular back-ups/images; Macrium Reflect highly recommended; http://www.macrium.com/reflectfree.aspx
Do you have logs by results of "work" with protection-software after uninstalling F-Secure?
Just interesting to understand.... which items was in system and not detected by F-Secure and etc.
Logs about scan-process/remove-actions about trojan, spyware,viruses and other malware.
Also, just questions:
- Did you Full Scan by F-Secure before uninstalling?
- Which browser you usually to use?!
- Did you try to re-check some settings about "scan-processes" (or it was totally default always)?
- Do you often download various/other software from not official webpages of that programs?
Sorry for questions. Also just interesting.
About other... probably here should be F-Secure Team's answer.
Windows update-channel / option / feature / registry key (from true-to-false) can be blocked not just by Trojans or malware.
It's can be like results of work any "tune up"-tools too.
Any unwanted programs like toolbars (which can be installed with "wanted"-dreams). And other variants.
Practically... if trojan-software blocked Windows Update... it's mean it's popular trojan and it's should be known for F-Secure and it's should be blocked by F-Secure.
Or detected by Full Scan (if smart/fast scan not detected);
If it's unknown trojan-software... and some kind of new... it's practically... not reasonable for malware authors.. blocking Windows Update. Because it's so "visible" for user.
Modern malware want be hidden and invisible. :)
Here... just a big different.
Shoud you trust to protection-software or not can be with various meanings:
- I can to trust for F-Secure company, but can not to trust for companies from your first reply (where you explain about your steps after uninstalling). It's not matter - which protection-level have that companies (it's not better, than F-Secure) - but I can not to trust for that companies.
It was first meaning.
- I can to understand that F-Secure give high-level for protection.
That level can not be much better with other protection-software. Different can be in specific-features, default-settings or "user-style". For example, NOD32 can to protect against a lot of "safe" potential unwanted applications (which F-Secure allow for user, because F-Secure think.. that user are right with steps about "safe" applications; NOD32 think.. that OK.. not matter if application are "safe" - we will be detected that, because probably user wrong understand "what he do").
For totally protection against malware and trojans - not enough just protection-software.
You (any user) should be so careful with modern-web. And it's sadly.
Because that.... nice, when protection-software can to do that "sadly picture" - more interesting.
When user can to trust for protection-software-company..... it's nice.
When it's also good protection-level - it's already can be "worry-free";
But worry free with "careful" steps and actions in web (without special tries to download malware and launch it) or just be careful with strange situations..
Anyway... detection-name "Trojan" can be not always trojan-file. And also can be a lot of other detections - which not related with trojan, malware or other. But detection-name looks like that "something scary" - because current practice with detection-name in companies... some kind of "scary" :).
It's not nice too.
With other protection-software.. you also can to meet troubles with system.
It's not totally related with F-Secure.... of course... if it's not possible to check.. which files / viruses / trojans / spyware... was detected by other companies. Maybe all of them was false-positive.
Or all of them... can be detected by F-Secure with Full Scan for system or by Real-time Scanning during access or related things.
OK, probably here can be other steps, which probably you did not do..... or if you do that (so.. it's another situation):
- By default - Full Scan for system should be without "advanced option for advanced scan" - but maybe it's default (?!).
Anyway.... Full Scan can be with three options (it's can to change in Settings) for optimisation scan-process (Manual-scanning).
Here can be "scan just known files", "scan zipped files" and "advanced scan setting" (which create much better detection-status);
If you use just "last two" options... and Full Scan was without detect...
So, probably here....:
- unknown malicious files for F-Secure (it's not really likely in that situation... but can be);
- something close to rookits - but...... it's some kind of strange too; If other software detected that so fast and without troubles, but F-Secure not.
- your system meet some Adware (where usually something like toolbars or other... but it's also can be virus/malware, of course too) which blocked Windows Update.
F-Secure not detected that........ because application was "safe" (but unwanted and potentially riskware - but without maliicous actions).
Anyway F-Secure should blocked "malicious" adware, potential unwanted software and etc. Current your "example" about protection-software... not always better with detection around "same" files. But it's can be.
F-Secure can not to detect troubles around Windows Update (probably) and just because - it was says "All OK".
Your examples (one of them, certainly can) detected that situation like result of "viruses or trojans" - but it's not always like that.
So... here just sad.. that you don't have logs about detection-names by other protection-software.
And things.. about "what was detected/removed" and etc.
F-Secure can in some situations not prevent something malicious, but other companies too. And other companies in some situations - do that more often, than F-Secure.
Here most "reasonable" variant (for me) - that you maybe downloaded some software from any soft-portal (not by official page) and it was with "malicious" or "safe, but unwanted" payloads. Here usually.. you able to "uncheck" payload during installation-process.
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