How to delete A viroses with out delet the file

I have important files and pictures when I do scan it delete all the files and folders
If there any way to delete only the viruses with out delete the files
Please Help

it depends if it is a real virus…only files that have been injected with viral code can be repaired

Clean, Quarantine, or Delete?
http://antivirus.about.com/b/2007/03/11/clean-quarantine-or-delete.htm

what is the malware name that avast give ?

It’s shows Trojan

when I insert the flash usb outmatch it scanning and deleting my flies

It is very important files

Trojan what…and where is it located

a Trojan can not be cleaned as the hole file is the trojan

Check for malware with this

Malwarebytes Anti-Malware 1.51. http://filehippo.com/download_malwarebytes_anti_malware/
always update so you have the latest signatures before you scan
click on the remove selected button to quarantine anything found

post the scan log here