When printing from Internet Explorer in Protected Mode, you may find that Internet Explorer locks up. After, or possibly even before, you kill the Internet Explorer process, you receive the following error:
IE Protected Mode Error
A website wants to open web content using a program on this computer? What does that have to do with printing?
Well, thanks to several blogs, I pieced together that it is due to the fact that my paraticular printer (a HP LaserJet P1505n) is trying to open the HP print monitor when you print. Since IE is in protected mode, it blocks that (as it should).
My solution was a little ugly, but it works! I renamed the HP1006MC.exe file referenced in the error to HP1006MC.exeOLD. I noticed that there is an option to disable printer status alerts in the print properties, but since this is a network pritner, I didn’t have the option to change that.
…Back to printing!
UPDATE
Ok, for some reason I didn’t even think to try checking the box “Do not show me the warning for this program again.” Do that and click “Allow” and that should solve your problem! 
Some things aren’t as complicated as they seem!
Some things aren’t as complicated as they seem!Luke