This may be because you have a virus and the virus/trojan has restricted you from accessing this to solve the virus. Effectively, the virus will stop you from getting rid of the virus if that makes sense.
virus'
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The Millican Virus
Your computer might be affected by virus. Perform a virus scan. Or re-install your OS!
you don't
Go to My Computer > Control Panel > Download removal software > Guffins > Remove To remove the virus My Computer > [Insert your anti virus software here] > detect virus > delete
It could be disabled by some program which made changes in your registry. What you need to do it is run a complete anti virus scan and if your computer is virus free do a system restore to the data your control key was working
to find out look on a health/ doctor website
HIV is the virus that causes AIDS. Medications can control this progression.
Once a virus is installed, it usually has full control of your computer, meaning it will either do what it can to dammage it, or keep it in perfect condition and steal your data.
To delete the installed shield manager virus simply go to control panel ant then uninstall programs to remove it.