t_hurt..

As you may (or may not) have found out, "Additional Guard" is a rogue anti-spyware program. See the following removal guide:

Remove Additional Guard (Uninstall Guide)

NOTE: Step #3 instructs you to download (and run) rkill.com. There are three other versions of Rkill, which have different extensions. Try the one suggested in the guide. If it doesn't run, try the second. IF one DOES work for you (immediately) run a Quick Scan with MBAM. Instructions for installing Malwarebytes' Anti-Malware are within the guide.

http://download.bleepingcomputer.com/grinler/rkill.exe
http://download.bleepingcomputer.com/grinler/rkill.scr
http://download.bleepingcomputer.com/grinler/rkill.pif

If Rkill doesn't help, give the below a try. :

http://www.raktor.net/exeHelper/exeHelper.com
http://www.raktor.net/exeHelper/exeHelper.scr

Follow ALL the steps and instructions in the removal guide.

Best of luck..
Carol