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2015 installation failed - required files in use - retry, ignore, cancel

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Logged on admin account.
Shut down all running programs - application list in task manager empty.
Disabled Norton antivirus.
Went thru system tray, exited all programs I could.
Ran 2015 upgrade install.
Got required files in use - retry, ignore, cancel.
No info on what file(s) were in use. Since I have already shut down every thing I can, what do I try next? Safe mode? any way I can find out what files are in use? Is ignore a safe option?

0 Users found this helpful

Try to use the cleanup utility, follow all instructions very carefully. Reboot and try to install again.

Hello James,

please refer to this article for more information.

Pat, thank you very much for helping!