This seems to be an issue that plagues us quite a bit and I'd like some assistance. We can't seem to install Pharos Admin (for Uniprint 8.3) on our Windows 7 x64 workstations at all. Every time we try we get an error that we can't write to msxml6.dll. We've tried to run as admin, running as a local admin, running from an elevated command-prompt and nothing seems to be be working. We have, in the past, had success with renaming the registry key for the install location so that it points to C:\Program Files\ rather than C:\Program Files (x86)\ and that doesn't seem to want to work now either. Any advice would be welcome.
And never mind. I always forget to try to turn off the UAC! Turned that off and now we're in business!