You are very warm bread.
It can be undone but now with Access Protection enabled you'll have to jump through a hoop or two, so I'll make the hoops as small as I can.
1. Boot to safe mode
2. Open regedit and modify just the value "UIPmode" found at HKLM\Software\McAfee\DesktopProtection. Set it to 0.
And now you should be able to modify anything via the Console.
If anything is still grayed out, perhaps the logged on user is not an admin.
Large... I meant large hoops! LOL
I can't help but chuckle a little envisioning someone jump through small hoops.
Outstanding my friend! As I'm sure you know, the access protection was interfering with and prohibiting any software installation I attempted to execute. As it turns out, I continued to stab at the password...low and behold, I cracked it. My hope is that someone else may stumble upon this thread and be saved by your knowledge. God Bless!