Adobe Opens In Protect Mode After Update To Reader X 10.1.1?

Windows 7 recently updated to Adobe Reader X 10.1.1 from 10.0 and now, every time I try to open a pdf file, the screen flashes,changes from 1368x720 down to 640x320, reduces screen size and open a dialog box stating "There is a problem with your system configuration". It gives options to open in protected mode, protected mode disabled, or always open in protected mode.Now, let me also state that I have also installed the 64bit iFilter suggested by Adobe themselves and have looked for registry changes or missing file components, of which I can find none. I realize Adobe is not truly 64-bit compatible, however, it used to work fine and it will not roll back the driver to 10.0 where it worked flawlessly.I know that McAfee and iolo both can cause system conflicts with this program in Win 7 64 bit, but have never seen anything quite like this. I removed System Mechanic and AVG both, cleared the temp files and registry locations, uninstalled Adobe and re-installed. I also tried removing Silverlight and performing the same procedure, all to no avail.System is a Dell Inspiron i3 processor, 4GB of memory, Win 7 Home Premium 64-bit. Had zero issues until the update.