You can start researching what's starting with tools like https://technet.microsoft.com/en-us/sysinternals/bb963902.aspx (AUTORUNS) and use google to research what each item is.
But be sure there's no malware in the PC. I like to use Grif's list at http://www.cnet.com/forums/discussions/how-to-remove-pup-option-603542/#post-f742c795-5881-433b-a29b-6d758efe5cd3
box keeps popping up about windows installer

Chowhound
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GameFAQs
GameSpot
Giant Bomb
TechRepublic