Felicia has been having problems with her computer. Her documents won’t open, her computer is running slow, and programs automatically open. Which preventive measure did she fail to take, because of which this is happening?

Installing Antivirus Softwares

Explanation: Felicia's computer have been infected by a virus (malwares), some virus slows down a system, run program by them self and eats up a chunk of important files in the system, rendering them useless. This whole issue could have been preventded, Felicia failed to install an antivirus software that searches for malwares from any input paths in the system and delete them( kill them off).

can you explain it better

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