Its been my exp. that some of these viruses attach themselves
to windows systems procs and cant be deleted by standard
anti-virus programs , unless the anti-virus program has a reboot sequence and deals with it before windows fully loads.
If you’ve got inadequate anti-virus protection, whereas it recognizes the virus and deletes associated files while Windows is fully on,
then the virus reacts and creates new files with new names,
with every reboot. By the time you get a top-notch anti-virus
program installed, the virus may have done so many new file
iterations that the new and good Anti-virus program just isnt programmed to follow that deep into the file iterations. The good anti-virus program may only be programmed with the assumption that you are only dealing with relatively newly acquired virus’s, not ones that have been dealt with inadequately by an inadequate anti-virus program, have ‘burrowed’ repeatedly with new file names, etc.
Been there done that.
For instance MalwareBytes Anti-virus program would
be an inadequate anti-virus program for such a ‘burrowing’
virus that attaches to windows procs.
Try Kaspersky Anti-Virus/ Internet Suite.
As to the call of ‘Bull’.
Restrain yourself matador.
Perhaps you should take your own advice.