I just downloaded libre office 3.6.2 and its help file. Norton Internet Security flagged and removed the help file installer for containing a virus
Norton seems to have fixed this recently. I can now install the help file. Thanks for your attention.
Probably due to “WS.Reputation.1”.
It isn’t a virus, but Symantec’s “the wisdom of crowds”. 
Read more… → WS.Reputation.1.
You may restore the file from Norton’s “quarantine”
via "Security History → Quarantine → Options" (→ detailed).
[By the way: I could install "LibO_3.6.2.2_Win_x86_helppack_en-US.msi" without any problems, but now a manual “insight network scan” with Norton Internet Security removed this file (with a recoverable backup in the “Security History Quarantine”).]
Edit 2012-10-11
See also → Bug 55681 - LO3.6.2 Built-in Help package does not install
Status: RESOLVED NOTOURBUG
Personally, for an Anti-Virus I use Microsoft’s own Security Essentials, I’ve never had false positive, nor have I had problems with malware on my system. Might be something to consider when you subscription for Norton comes up for renewal. you can find it at http://windows.microsoft.com/en-US/windows/products/security-essentials if you’re interested.