Trying to remove the folders from Windows one system empty, but in error "is a Windows system folder and is required for Windows work.» It cannot be deleted. »

My parents bought a laptop from a friend, and recently my father ran an antivirus program that came with multiple files in a folder that has been created by this friend. When you try to delete the folder a box appears that says "it is a Windows system folder and is required for Windows work.» It cannot be deleted. "But all the folders inside are empty and of no use to us. Help?

The standard answer to questions that begin with «I bought a used computer...» "is you can do a clean install of Windows, because you know not what could be hiding somewhere in the computer.  In this case, it seems as if he is infected with something.

Legally, the seller was required to give you a way to do this reinstall, but in the vast majority of the private sales of used computers, this requirement is simply ignored.

If it's a laptop to 'mark' (e.g., Dell, HP, IBM/Lenovo) there may be a hidden partition on the hard drive that can be used to restore the computer to its "fresh from the factory" State.  Of course, this will remove all applications that the previous owner had installed after he or she has bought new, but you should still seriously to consider making such a restore, if the mechanism is available.

What is the name and the version of the antivirus application that has detected the wrong files?
What are the names of the files?
What is the name of the folder that cannot be deleted?
Are you logged on as a user with the rights "computer administrator" when you try to delete it?

Assuming that you can not or will not do a clean install of Windows, I suggest the following (do not run scans at the same time, each analysis may take some time, depending on the number of files on the computer):

Connect as a user with the privileges "computer administrator" and do a full scan with each of the following:

http://www.eset.com/us/online-scanner
http://www.Microsoft.com/security/scanner/en-us/default.aspx (requires download)
http://www.PCtipp.ch/downloads/Sicherheit/35905/multi_av_scanning_tool.html (page is in German, but the downloaded scanner is in English)

Also download, install, update and run a scan complete with each of the following:

MalwareBytes AntiMalware
SUPERAntiSpyware

Tags: Windows

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