Scans detect viruses that cannot be deleted

First time to post in the forum! Thanks for any assistance anyone can provide!

Complete scans detect three viruses are present that cannot be deleted. They are part of archives according to Mac Security information.

Looking back at the Norton Security window, each of the above named threats is defined as follows: rlistupdater is OSXMalcol.2, assestschanger is OSX.TROJAN.GEN, and Seagoing is OSX.MALCOL.

Also, I frequently get a warning which says, "system infected ADWA 80." What does this refer to? Trojan, other malware?

Any help is appreciated!

Thanks!

Jim