File writing error extraction from C:/User/user/appdata/local

Solved
Hello (I can't find the place to make my request, sorry)
For a few days, it's been impossible to download software
Here is an example for C.cleaner
Extraction: writing error of the file C:/Users/User/appdata/local/tmp/nsx7E11.temp/system.dll, this is for this software; for another, the coordinates change of course
I should mention that I ran a system check with SFC scannow which says it has fixed errors, but that may not be related?
Can you help me resolve this issue? Thank you in advance.

29 answers

  1. It's a story that strongly evokes a Trojan horse, and the problem is that, apparently, we can no longer download utilities.

    With a bit of luck, start by:
    -clearing the temp folder and the C:\Windows\Temp folder
    -browsing Program Files for folders that do not correspond to installed programs
    -opening Windows services, stopping all those that do not correspond to a normal program in a similar manner
    -in the control panel, uninstalling anything that has the same configuration
    -checking for any abnormal entries in the start menu-startup
    -opening the registry, editing, searching: run (full word) then runonce (same), identifying all abnormal entries as well.
    Restart the computer.

    If that’s not enough, life is going to get a bit more complicated.
    It may happen that a particular browser is affected (often Internet Explorer, which is convenient as it's built into the system): is the behavior the same with another browser?
    And you will need to find either another operating system (Live CD or USB, existing multiboot...) or another PC to download suitable anti-malware.