Duplicate Name
The name "ContactTrigger" is already used on component type: Apex Trigger. Please rename existing component.
Duplicate Name
The name "OpportunityTrigger" is already used on component type: Apex Trigger. Please rename existing component.
Duplicate Name
The name "LeadTrigger" is already used on component type: Apex Trigger. Please rename existing component.
Duplicate Name
The name "CaseTrigger" is already used on component type: Apex Trigger. Please rename existing component.
Duplicate Name
The name "AccountTrigger" is already used on component type: Apex Trigger. Please rename existing component.
what should i do? if i rename,will it affect other app?
It seems you are trying to install an appexchange package. By any chance this package was installed earlier?
Are you installing this org on a developer org? Have you checked if the trigger with the above names already exist on your org?