I upgraded from 64bit vista and it mostly seams to work fine. But for some reason I can seem to install new software, uninstall or change details from my user accounts. The installs give an error message like: Cannot verify the digital signature: a recent download or malicious software may be causing the problem.... Uninstalls error with: This may have already been uninstalled. Would you like to remove it from the list. - Then clicking yes does nothing. Or sometime - System Administrator has set policies to prevent this installation. But it won't let me change them or run the installer as administrator. I have tried to boot with out the signature verification and tried to restore to the earlier configurations (although I don't know if I could install then as I didn't try to) Any ideas?