Generally, no. While the Read Only attribute will protect your files from a few viruses, most simply override it, and infect normally. So, while setting executable files to Read Only a good idea (it protects against accidental deletion), it is certainly not a thorough protection against viruses! In some environments the Read Only attribute does provide some additional protection. For instance, under Novell Netware a user can be denied the right to modify file attributes in directories on the server. This means that a virus that infects such a user's machine will be unable to infect files in those server directories if the files have their Read Only attribute set.
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