Chrome deleting Norton virus file?

I installed Chrome a month or so ago, at the recommendation of the Family Search website as it is the only

browser that seems to interface with their site without problems.  About a week and a half ago,  I turned on

my computer and went to update my virus definitions and found my whole virus file was gone.  Soon after

that, a window popped up and said that Chrome had removed add-ons and listed Norton 360.  Did Chrome

actually remove that virus file?  If so, what can I do to make sure that it doesn't happen again.  My desktop

is on dialup and it took six hours to restore the file.  That's for your help.  Theresa