Internet security is a scam program. It is going to lock down your puter if your not careful.
The links below are for removal of Internet Security 2013 for XP, Vista, and win 7.
http://www.bleepingcomputer.com/virus-removal/remove-xp-internet-security-2013
http://www.bleepingcomputer.com/virus-removal/remove-vista-internet-security-2013
http://www.bleepingcomputer.com/virus-removal/remove-win-7-internet-security-2013
If all else fails you will need to try to recover your data and files. Go to the link below and read on how to download a Linux Live CD to boot the system to recover what you want. If you have a Windows 8 puter then you need to turn of secure boot before using the CD. The live CD will also allow you to check out the rest of the puter. It helps to have a thumb drive or a external drive to copy your data and files to.
http://www.howtogeek.com/howto/windows-vista/use-ubuntu-live-cd-to-backup-files-from-your-dead-windows-computer/
After you get your data backed up and you have a brand name puter and a recovery partition then you can use the link below to get to the BIOS menu to restore it back to factory settings. When you press the power button start tapping the F key that is for your puter and the BIOS menu will open. Select the recovery and it will set your puter back to factory settings. Depending on your puter this will take one to two hours.
Manufacturers BIOS menu F key
HP/Compaq ESC
Sony F2
ASUS Del
Gateway, eMachines F10
Acer, Dell, Fijitsu, Gigabyte, Toshiba F12
Your BIOS menu should look something like this. Yours might be different. I am posting this to give you an idea of what it looks like.
F1 = System Info
F2 = System Diagnostic
F9 = Boot Device options
F10 = BIOS Setup
F11 = System recovery