troubleshooting Question

Can Trojan's/Virus' attach to or replace valid files?

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jimrichmond asked on
Anti-Virus AppsHardware FirewallsAnti-Spyware
4 Comments3 Solutions694 ViewsLast Modified:
Do trojans or virus' replace or attach to valid files?  We have tried many antivirus/spyware/malware programs (AVF, McAfee,Ad-Aware,Advanced System Care,etc) Sometimes these programs tag valid files as trojans or virus', and if you let them "rapair" the problem, then some programs or system functions don't work anymore.  I can understand if malicious code actually replaced a good file's contents with its own problem code, that the antivirus program would want to delete it.  Is this what happens?
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