First, you have to kill the process that's doing all this.
Hit Ctrl-Alt-Del, choose Task Manager, and look for tasks
install.exe
05643921.exe
Kill them both. Now you should be able to run regedit to remove unwanted entries:
HKEY_LOCAL_MACHINE\software\microsoft\windows\currentversion\uninstall\systemsecurity2009
HKEY_LOCAL_MACHINE\software\microsoft\windows\currentversion\uninstall\systemsecurity2009 displayicon
HKEY_LOCAL_MACHINE\software\microsoft\windows\currentversion\uninstall\systemsecurity2009 displayname
HKEY_LOCAL_MACHINE\software\microsoft\windows\currentversion\uninstall\systemsecurity2009 shortcutpath
HKEY_LOCAL_MACHINE\software\microsoft\windows\currentversion\uninstall\systemsecurity2009 uninstallstring
And then look for the following files on your hard disk (be sure to include system and hidden files):
05643921.exe
install.exe
system security 2009.lnk
system security 2009 support.lnk
There are a couple of variants of this fake security tool, if yours is different, look for strange processes in Task Manager first, kill them and then look for further help.
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