|Indeed try unstall 8 and go back to 7|
Your story is not clear
I can not open internet explorer either, and some items are missing like my tool button on ie.
You can't open it and there is no button (HOW DO YOU KNOW IF YOU CAN'T OPEN IT')
Please take a minut to write down the correct facts.
BTW A firewall has nothing to do with not opening a local installed application neither has a missing button.