APPEARANCE of strange files, programs, or desktop icons
Programs running, turning off, or reconfiguring themselves (malware will often reconfigure or turn off antivirus and firewall programs) Strange computer behavior Emails/messages being sent automatically and without USER’s KNOWLEDGE (a friend receives a strange email from you that you did not send).
There seems to be a lot of network activity when you are not using the network.
The available memory on your computer is lower than it should be.
Programs or files appear or disappear without your knowledge.