If this is literally true--i.e. you look in start, all programs, or in
control panel, add or remove programs, then you have installed some form of
go-back or protective software which is removing the install.
I believe we've seen this a couple of thimes before, but I can't recall just
what the software was--think about other security software on your system,
too.
--
"DefenderWorks?" <DefenderWorks?@discussions.microsoft.com> wrote in message
news

ED24021-593E-489B-9755-(E-Mail Removed)...
>I download the Defender, install it and make a full scan. Everything looks
> fine. However, when I reboot the machine, the Defender is gone. It is not
> in
> system anymore. I donwload and re-install it again. Same thing happens
> after
> reboot.
>
> Any idea?