Kaspersky silently deletes "Infected" false-positive .exe files

Browsing through my old development folders I noticed that executables of some applications I developed years ago (using Borland C++Builder) were missing. Luckily I had the same folders in zipped archives. Trying to extract affected .exe files from .zip archives were failing with Access Denied errors. Trying to extract whole folder was resulting in the affected .exe files disappearing.

All this looked like actions of an antivirus software. However, my Kaspersky was showing that everything was fine, computer protected, no alerts, no errors, etc. After manually diving into Kaspersky Quarantine (under More Tools section) I found that my application was silently quarantined as HEUR:Trojan.Win32.Generic.

As this was an application I developed myself, I was pretty sure that it wasn't a Trojan. Just to be completely sure I scanned the affected .exe files on Virustotal and no other mainstream antivirus had any issues with these files. It was pretty obvious that the detection was a false-positive.

The user profile service service failed. The sign-in user profile cannot be loaded


Creating a new local profile on a Windows 10 PC. When the new user tried to login for the first time following error is displayed:


The issue was caused by a corrupted Default user profile (that is used as a template for new user profiles). To resolve this I had to copy the default user profile from another Windows 10 PC (C:\Users\Default).

QuickBooks multi-user access stopped working (error H202)


Users on QuickBooks 2014 can no longer open company files in multi-user mode. Following error is displayed then trying to enable multi-user: "H202 - You're trying to work with a company file located on another computer, and this copy of QuickBooks can't reach the server on that computer"

Can't re-install Sage Payroll - "Select Previous Installation" empty


Cannot install Sage Payroll 50 on a PC that previously had the same Sage application installed. During installation process user gets to a screen "Select Previous Installation":

The "Previous Installation" list, however, is emty and setup doesn't allow to proceed any further or skip this step...


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