Great question — answering as the UphillTech team:
Ignore what your friends say... the only "deterioration" that would be noticed is the normal wear and tear of your hard disk... if you do a traditional "dual boot" then only one operating system can be "in use" at any one time - i.e. you can't boot Windows and Ubuntu simultaneously. You can , however, access the Windows (NTFS) partition through Ubuntu. Ubuntu should have automatically identified that you have Windows installed and installed alongside it... this is they key... Ubuntu knows about (and can mount/read/write) the NTFS partition. See this AskUbuntu solution: https://askubuntu.com/questions/568577/pulling-files-from-a-windows-ntfs-partition-into-ubuntu
Full answer by Kinnectus: https://superuser.stackexchange.com/a/1010694 (CC BY-SA 3.0).
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