Can't run AVG & MalwareBytes!! "...prevented by a software restriction policy"

Hey all! I think I may have been infected with malware that changed something in my registry. I use a laptop tablet currently running XP tablet & am pretty careful about browsing safely and avoiding viruses/malware. However, when I recently got on the laptop tablet I noticed that AVG was no longer in my task bar and when I tried to open the program, I received an error notification that read, "Windows cannot open this program because it has been prevented by a software restriction policy. For more information, open Event Viewer or contact your system administrator."

I then tried to run Malwarebytes, it wouldn't run & the same restriction message popped up...

I do plan on installing Windows 7 after the new year...

Any assistance is greatly appreciated... :banghead:

-Doug