I think I installed Windows 8.1 over top of Windows 7. Will this be a problem?

Basically, I didn't perform a clean install of windows 8.1 (by accident). I kinda just slipped the disc in when I wasn't thinking and installed completely before realizing that you should always perform a clean install for the best performance. I have 8.1 up and running perfectly, but there is a folder named "Windows.Old" underneath the normal "windows" folder. Is this going to be a problem? Will it affect the Acer eRecovery Management partition on my drive at all? I just want to make sure there isn't anything completely wrong with my system so that if it is not required, I won't have to format the drive and re install windows again. I have about 100gb of files still on here from the windows 7 install that I can still access, and if possible would rather not have to format and reinstall. My laptop is an Acer Laptop (obviously) with a core i7 2670qm, HD graphics 3000, 6gb RAM, and a 1tb HDD. Thank you :)

EDIT: Also, I was wondering if it would be safe to somehow get rid of the Windows.old folder. I am upgrading my hard drive to a 250gb Samsung 840 EVO, and would like to save as much space as possible. Not a big deal but would like to know.
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    Obviously the best option is to clean install it so you don't have to worry about any future issues etc. Alot of junk files are kept on your computer (more than just windows.old).
    It isn't the biggest deal in the world but since you're starting from scratch on win8 anyways, you may as well fresh install the entire OS
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