are you on a usb key? i had to upgrade to a usb key and it was a big pain and expence ended up reinstalling the software twice and finally found that a upgrade from adobie reader auto updates had created the problem, i no longer do any upgrades to that computer unless i have no choice and i don't even have it hooked up to the internet i use another computer for the internet then use a thumb drive to xfer files, i cant afford for it to have that kind of problems so its now an isolated system