Have for a long time Problems starting Firefox. Start getting ahead of Firefox and Internet Explorer from the message.

"The application or DLL C: \ WINDOWS \ system32 \ pngsn00q.dll is not a valid Windows file check this with the installation disk.".

Kaspersky Mosert on Trojan.Win32.Agent2.cuos in the above directory.

Followed the advice of the distance and reboot the system. No further message anymore.

I start the computer after shutdown but at some point again, the same message appears every time!

Question: proper notice or "spin" here Kaspersky?

Thanks for your help!