I have problem with my pc "Downloads Files"

[PranKk.]

• Your Nickname: Prankk
• Your Problem: I can't open (Download file), someone help me fast its virus or what i cant fix this problem!, Also that virus fked my pc give so big lag 
• Screenshot: 
• PS: That is say in bg:
• this file has no program associated with it to perform this action. create a connection in the "Set Connection" From the control panel.
• here is again virus - help how can i fix this also https://imgur.com/a/eG8EnfV