Purchased Elements 12 via internet. Was using 13 as trail. Was stupid and somehow deleted some files from registry. When I now install elements 12 it installs everything but when start with the Shared Technologies it gives an error message and does a roll back. Have reinstalled 13 and then removed it again with both inbuilt uninstaller as well as Perfect Uninstaller. The problem persists. As trail to see if the download wasn't the issue I installed it on a friends PC without issues. Was then uninstalled. Program not yet activated to my name on Adobe website. I hope it will be possible to fix without complete formatting of my HDD. All help welcome.