My ESET was recently flagged up as not running. When I tried to restart it, it said I had the wrong version for my OS (7 Home Premium 64 bit). Re-downloaded and installed with no issues. An hour or so later the two user accounts on the machine came up as being time restricted and would not let access. Also a new password protected user named --666-- appeared. I immediately panicked and disconnected the modem cable. I've since formatted the drives and re-installed 7. Was this a virus?