A problem I had when I first started with this is that you can't run multiple version of Office on the same OS.
And you can't run any mix of x86 and x64.
I actually had to reformat to fix the problems once I had installed office 2007 on the same windows as office 2013.
No amount of un-installing was able to clean up the registry properly.
So, hopefully you have save those update files somewhere safe !
It might be a great time to do a major spring cleaning to your hard drive.
Reformatting is not as hard or time consuming as it use to be and it will speed up you pc some
if you don't re-install all the crap you don't need right away lol
Good Luck and don't forget to back up your ED folder if you don't want to have to re-download it, and it's two folders under:
C:\Users\**YOUR NAME**\AppData\Local
I have Office 2007 32Bit(registered) and Office 2013 64Bit(Testversion, not activated) running on the same OS and don't have any Problems, so its possible.
But you know, every System is different and if it's Microsoft you can't say "It's running on my System so it will run on your System", that's Microsoft....