I have multiple users on my home system

I have multiple users on my home computer. I have set them up with certain permissions, but now they can open IE explorer. It read error and asks to send error to Microsoft. No matter if I pick yes or no. it loops in to that cycle. Send will never open, but when you use the browser on outlook it let you search the internet. With this problem it won?t even let me open control panel. Explorer crashes. I ran Norton anti-virus it didn?t find anything. I also wipe the acct and created a new one and it does the same thing, but that doesn?t happen when I give them administrative privileges it works fine. PLEASE ADVICE