Newbie still confused about potential for virus problems on Ubuntu

[Ed Oneill]

I have clam av  but was told it is only for e_mail? and I am running avg free but want to try avast also!
What is the chances of virus problem on ubuntu 8.10 if used to surf web,open e-mail and 
fileshare with transmission ? Am I correct thinking the Ubuntu os is not in danger only a windows based system I would interact with  is at risk and that is the reason to use virus scanners? Does clam av,avast,bitt defender and avg scan the whole system or do they only scan the windows based files It seems clam does not scan my shared files from windows and Avg shows errors and says it can not open Ubuntu os files it only scans shared files/folders!
 
Has anyone useing Ubuntu had virus issues and how would you know what are some of the possible problems if they exist ?
 
                                                                       Thank You ! 
 
                                                                                                                     Ed


      
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