A lot of sites have been infected in the last week due to a vulnerability that is well documented now. Here is the link:
Last week we had a portion of time when you would NOT want to come into this forum if you were not logged in.
I am glad McAffee is warning people if it has come back.
As long as you stay logged in it is fine.
I use McAfee (registered user) and I do not get a warning sign.
If you do see you computer redirecting pages after a Google search, though, you may have a problem.