How to remove Trojan VIRUS from the file without deleting the file?

How to remove Trojan VIRUS from the file without deleting the file ??? when i download a program (.exe) avast say it (detected) by Trojan , but it can't repair the file , must delete the file , please any help , anything may be useful like repair or fix the file , i want any trojan hunter can fix this problem... show more How to remove Trojan VIRUS from the file without deleting the file ???
when i download a program (.exe) avast say it (detected) by Trojan , but it can't repair the file , must delete the file , please any help , anything may be useful
like repair or fix the file , i want any trojan hunter can fix this problem , but not to delete the file , that is very important to me ??
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