is it avast repairs the virus threat.
Can you rephrase? What do you exactly want to know?
in boot scanning if avast scanning found virus.they displaying some option that 1.delete, 2. delete one, 3.repair and so on.i am having doubt in repair option. is it repairs the virus?
Repair the executable file (.exe, .com, etc.) that was infected. Only for these kind of files the repair will be available, for the other files infected, you can’t repair or repair will fail.
The main consideration in any decision is ‘first do no harm’ so don’t select options that are final like delete as your first choice.
Trojans generally can’t be repaired (either by the VRDB or avast virus cleaner), because the entire content of the file is malware, so it is either move to chest or delete, move to the chest being the best option (first do no harm). When a file is in the chest it can’t do any harm and you can investigate the infected warning.
The VRDB only protects certain files, .exe, dll and other system files (as Tech mentioned), it doesn’t protect data files or all files, it is not a back-up program, so there are going to be many occasions where repair won’t be an option.
Only true virus infection can be repaired, e.g. when a virus infects a file it adds a small part to it, provided that file is one that avast’s VRDB would monitor and you have run the VRDB, then it may be possible to repair the file to its uninfected state.
However, for the most part so called viruses, trojans (adware/spyware/malware, etc.) can’t be repaired because the complete content of the file is malicious.