It sounds like Windows Management Instrumentation (WMI)has been damaged
by the combination of malware and Symantec.
First, see if you can run this security software removal tool:
If you can, then remove all vestiges of Symantec and any other installed
If not or if you could remove Symantec with the aforementioned tool,
open an Elevated Command Prompt ( Start orb > in the Start search field
type in cmd > *right* click cmd.exe and choose 'Run as administrator' >
if no password is used click the Continue button; if one is used enter
it and then click OK.
At the Elevated prompt, type in the below and then press Enter
(Note the space between the " t " and the slash /)
If WMI reports that it's in an inconsistent state try running the below
You may have to run it twice. Reboot afterwards and then run the
verifyrepository command again to see if WMI was salvaged.
"Security updates should *never* have *non-security content* prechecked"
> I recently had a Trojan and Symantec anti virus removed it. However when
> I uninstalled Symantec (I wanted to place in another anti-virus) Windows
> Security became unavailable. If I go to Control Panel > Security nothing
> happens. When I try to access Windows Defender then I immediately get a
> blue error screen. Now whenever I open up Internet Explorer sometimes
> strange noises start to happen as if I'm watching a video. (goes away
> when IE closes) making me think Symantec was not successful. Also I am
> running Vista Home Premium.